I tested this with a couple of different games, and they all seemed to be affected by the same thing. This happens whenever I try to generate a material library. My settings (if that matters) are a brush library with a specific folder filter for each material folder in the game directory; for example \cstrike\materials\brick\ would have \cstrike\materials\ as its root, would have a folder filter of "nature", and would be named cstrike.brick.mat.
Also, instead of a blue bar filling up in the Material Library Generator window, and another window popping up, the bar remains grey, a similar error to this pops up, and, the Material Library Generator window no longer responds until I close it and open it again.
-- MAXScript Rollout Handler Exception:
-- Runtime error: Error opening bitmap: E:\Wall Worm Materials\cstrike\materials\Brick\brickwall003d.vtf
-- MAXScript callstack:
-- thread data: threadID:14456
-- ------------------------------------------------------
-- [stack level: 0]
-- In wallworm_vmt_MaybeSetTextureMap(); filename: C:\Users\Shane Jones\AppData\Local\Autodesk\3dsMax\2017 - 64bit\ENU\scripts\WallWorm.com\common\vmt_funcs.ms; position: 2157; line: 75
-- Parameters:
-- mapRef: &(prop diffuseMap Local:aMat) : undefined
-- texturepath: "Brick/brickwall003d"
-- extraPath: undefined
-- extraRootPaths: undefined
-- hasAlpha: &Local:dHasAlpha : false
-- Locals:
-- texturepath: "Brick/brickwall003d"
-- tex1: "E:\Wall Worm Materials\cstrike\materials\Brick/brickwall003d.vtf"
-- map: Brick/brickwall003d.vtf:Bitmap
-- hasAlpha: &Local:dHasAlpha
-- extraPath: undefined
-- extraRootPaths: undefined
-- theTex: #("E:\Wall Worm Materials\cstrike\materials\Brick/brickwall003d.vtf", true)
-- CanClose: true
-- mapRef: &(prop diffuseMap Local:aMat)
-- Externals:
-- wallworm_getBitmapFromPaths: Global:wallworm_getBitmapFromPaths : wallworm_getBitmapFromPaths()
-- wallworm_get_sourcematpaths: Global:wallworm_get_sourcematpaths : wallworm_get_sourcematpaths()
-- owner: undefined
-- wallworm_bsToFS: Global:wallworm_bsToFS : wallworm_bsToFS()
-- ------------------------------------------------------
-- [stack level: 1]
-- called from wallworm_vmt_loadMaterial(); filename: C:\Users\Shane Jones\AppData\Local\Autodesk\3dsMax\2017 - 64bit\ENU\scripts\WallWorm.com\common\vmt_funcs.ms; position: 8327; line: 192
-- Parameters:
-- materialPath: "E:\Wall Worm Materials\cstrike\materials\brick\brickwall003d.vmt"
-- matType: "brush"
-- brushColor: (color 155 155 155)
-- modelColor: (color 155 155 0)
-- dispColor: (color 0 155 0)
-- dispColor2: (color 155 155 155)
-- decalColor: (color 255 0 0)
-- extraPath: undefined
-- overWriteName: undefined
-- rootPath: "E:\Wall Worm Materials\cstrike\materials"
-- extraRootPaths: undefined
-- Locals:
-- VMatCompileFlags: dotNetClass:WallWorm.Helpers.VMT.VMaterialCompileFlags
-- vMatHasFlag: HasFlag()
-- vmtHelper: dotNetClass:WallWorm.Helpers.VMTHelper
-- tr: undefined
-- defaultColor: undefined
-- dispColor: (color 0 155 0)
-- dispColor2: (color 155 155 155)
-- decalColor: (color 255 0 0)
-- extraPath: undefined
-- extraRootPaths: undefined
-- vMatHasCompileFlag: HasFlag()
-- materialPath: "E:\Wall Worm Materials\cstrike\materials\brick\brickwall003d.vmt"
-- vMat: dotNetObject:WallWorm.Helpers.VMT.VMaterial
-- dm: undefined
-- aMat: brick/brickwall003d:Standard
-- c: undefined
-- vMatMaterialType: dotNetObject:WallWorm.Helpers.VMT.VMaterialType
-- VMaterialType: dotNetClass:WallWorm.Helpers.VMT.VMaterialType
-- dHasAlpha: false
-- matType: "brush"
-- brushColor: (color 155 155 155)
-- modelColor: (color 155 155 0)
-- overWriteName: undefined
-- rootPath: "E:\Wall Worm Materials\cstrike\materials"
-- VMatFlags: dotNetClass:WallWorm.Helpers.VMT.VMaterialFlags
-- Externals:
-- wallworm_texture_transform: Global:wallworm_texture_transform : StructDef:wallworm_texture_transform
-- owner: undefined
-- ------------------------------------------------------
-- [stack level: 2]
-- called from wallworm_generateMaterialFromVMT(); filename: C:\Users\Shane Jones\AppData\Local\Autodesk\3dsMax\2017 - 64bit\ENU\scripts\WallWorm.com\common\matgenfuncs.ms; position: 8620; line: 304
-- Parameters:
-- vmt: "E:\Wall Worm Materials\cstrike\materials\brick\brickwall003d.vmt"
-- addMat: undefined
-- matType: "brush"
-- brushColor: (color 155 155 155)
-- modelColor: (color 155 155 0)
-- dispColor: (color 0 155 0)
-- dispColor2: (color 155 155 155)
-- decalColor: (color 255 0 0)
-- extraPath: undefined
-- overWriteName: undefined
-- rootPath: "E:\Wall Worm Materials\cstrike\materials"
-- extraRootPaths: undefined
-- forceMaxScript: false
-- materialPaths: undefined
-- Locals:
-- diffuseName: undefined
-- selfIllum: undefined
-- normalmapalphaenvmapmask: undefined
-- normalmapalphaenvmapmask2: undefined
-- op: undefined
-- d: undefined
-- bmWidth: undefined
-- val: undefined
-- tex1: undefined
-- vmt: "E:\Wall Worm Materials\cstrike\materials\brick\brickwall003d.vmt"
-- addMat: undefined
-- forceMaxScript: false
-- isTranslucent: undefined
-- vmtval: undefined
-- allpathstocheck: #("E:\Wall Worm Materials\cstrike\materials")
-- lineNum: undefined
-- theVMT: undefined
-- displayMatname: undefined
-- materialPaths: undefined
-- transforms1: undefined
-- transforms2: undefined
-- param: undefined
-- tr: undefined
-- ambientocclusionName: undefined
-- envmapmask: undefined
-- coords: undefined
-- displayMatdiffuseMapBM: undefined
-- dispColor: (color 0 155 0)
-- dispColor2: (color 155 155 155)
-- decalColor: (color 255 0 0)
-- useMat: undefined
-- makeNewMats: undefined
-- extraPath: undefined
-- extraRootPaths: undefined
-- oldsilentmode: false
-- displayMatdiffuseMap: undefined
-- color1: undefined
-- pos: undefined
-- theTex: undefined
-- opacityName: undefined
-- phongexponenttextureName: undefined
-- blendV: undefined
-- frx: undefined
-- fry: undefined
-- frz: undefined
-- kwvars: undefined
-- cp: undefined
-- bumpName: undefined
-- nocull: undefined
-- addMatB: undefined
-- c: undefined
-- CanClose: undefined
-- displayMatnameB: undefined
-- maxfogdensityscalar: undefined
-- SubRectSize: undefined
-- color2: undefined
-- tex2: undefined
-- bmHeight: undefined
-- matType: "brush"
-- brushColor: (color 155 155 155)
-- modelColor: (color 155 155 0)
-- overWriteName: undefined
-- rootPath: "E:\Wall Worm Materials\cstrike\materials"
-- SubRectPos: undefined
-- displayMat: undefined
-- selfIllumName: undefined
-- mp2: undefined
-- lineArray: undefined
-- dName: undefined
-- theLine: undefined
-- Externals:
-- wallworm_reuse_diifuse_transform: Global:wallworm_reuse_diifuse_transform : wallworm_reuse_diifuse_transform()
-- wallworm_texture_transform: Global:wallworm_texture_transform : StructDef:wallworm_texture_transform
-- wallworm_generateMaterialFromVMT: Global:wallworm_generateMaterialFromVMT : wallworm_generateMaterialFromVMT()
-- wallworm_getBitmapFromPaths: Global:wallworm_getBitmapFromPaths : wallworm_getBitmapFromPaths()
-- wallworm_remove_last_slash: Global:wallworm_remove_last_slash : wallworm_remove_last_slash()
-- wallworm_blend_to_DXBlend: Global:wallworm_blend_to_DXBlend : wallworm_blend_to_DXBlend()
-- wallworm_give_mat_ww: Global:wallworm_give_mat_ww : wallworm_give_mat_ww()
-- wallworm_get_sourcematpaths: Global:wallworm_get_sourcematpaths : wallworm_get_sourcematpaths()
-- wallworm_get_color_from_string_arrays: Global:wallworm_get_color_from_string_arrays : wallworm_get_color_from_string_arrays()
-- owner: undefined
-- wallworm_getValueVMTVal: Global:wallworm_getValueVMTVal : wallworm_getValueVMTVal()
-- wallworm_bsToFS: Global:wallworm_bsToFS : wallworm_bsToFS()
-- wallworm_remove_first_slash: Global:wallworm_remove_first_slash : wallworm_remove_first_slash()
-- wallworm_sanitize_texture_path: Global:wallworm_sanitize_texture_path : wallworm_sanitize_texture_path()
-- wallworm_safe_path: Global:wallworm_safe_path : wallworm_safe_path()
-- wallwormAddTextureCAtoMaterial: Global:wallwormAddTextureCAtoMaterial : wallwormAddTextureCAtoMaterial()
-- ------------------------------------------------------
-- [stack level: 3]
-- called from vmt loop; filename: C:\Users\Shane Jones\AppData\Local\Autodesk\3dsMax\2017 - 64bit\ENU\scripts\WallWorm.com\common\wwmt_material_library_generator.ms; position: 2384; line: 69
-- Parameters:
-- vmt: "E:\Wall Worm Materials\cstrike\materials\brick\brickwall003d.vmt"
-- Locals:
-- mat: undefined
-- vmt: "E:\Wall Worm Materials\cstrike\materials\brick\brickwall003d.vmt"
-- useMat: undefined
-- Externals:
-- BlendMaterials: Free:BlendMaterials : undefined
-- ModelMaterials: Free:ModelMaterials : undefined
-- mdl: Free:mdl : false
-- count: Free:count : 0
-- oneLibrary: Free:oneLibrary : true
-- BrushMaterials: Free:BrushMaterials : undefined
-- total: Free:total : 43
-- usedecl: Free:usedecl : false
-- owner: undefined
-- bl: Free:bl : false
-- br: Free:br : true
-- AllMaterials: Free:AllMaterials : #materialLibrary()
-- wallwormMatGen: Global:wallwormMatGen : Rollout:wallwormMatGen
-- DecalMaterials: Free:DecalMaterials : undefined
-- ------------------------------------------------------
-- [stack level: 4]
-- called from wwmt_ceate_material_library(); filename: C:\Users\Shane Jones\AppData\Local\Autodesk\3dsMax\2017 - 64bit\ENU\scripts\WallWorm.com\common\wwmt_material_library_generator.ms; position: 3772; line: 100
-- Parameters:
-- p: "E:\Wall Worm Materials\cstrike\materials"
-- project: "cstrike.brick.new"
-- br: true
-- bl: false
-- mdl: false
-- folderFilter: "brick"
-- fileFilter: "*"
-- recurse: true
-- usedecl: false
-- forceMXS: false
-- Locals:
-- stopwatch: undefined
-- BlendMaterials: undefined
-- project: "cstrike.brick.new"
-- recurse: true
-- ModelMaterials: undefined
-- p: "E:\Wall Worm Materials\cstrike\materials"
-- mdl: false
-- count: 0
-- oneLibrary: true
-- BrushMaterials: undefined
-- wwmt_getFilesRecursive: wallwormFileOpsStruct.getFilesRecursive()
-- total: 43
-- matContinue: undefined
-- message: undefined
-- usedecl: false
-- forceMXS: false
-- br: true
-- bl: false
-- fileFilter: "*"
-- AllMaterials: #materialLibrary()
-- folderFilter: "brick"
-- DecalMaterials: undefined
-- Externals:
-- owner: undefined
-- wallwormMatGen: Global:wallwormMatGen : Rollout:wallwormMatGen
-- ------------------------------------------------------
-- [stack level: 5]
-- called from btnGenerate.pressed(); filename: C:\Users\Shane Jones\AppData\Local\Autodesk\3dsMax\2017 - 64bit\ENU\scripts\WallWorm.com\common\wwmt_material_library_generator.ms; position: 11701; line: 246
-- member of: Rollout:wallwormMatGen
-- Locals:
-- cont: true
-- errors: #()
-- message: undefined
-- Externals:
-- chk_modelLibrary: RolloutControl:chk_modelLibrary in rollout:wallwormMatGen : CheckBoxControl:chk_modelLibrary
-- chk_blendLibrary: RolloutControl:chk_blendLibrary in rollout:wallwormMatGen : CheckBoxControl:chk_blendLibrary
-- edtFolders: RolloutControl:edtFolders in rollout:wallwormMatGen : EditTextControl:edtFolders
-- owner: Rollout:wallwormMatGen
-- chk_brushLibrary: RolloutControl:chk_brushLibrary in rollout:wallwormMatGen : CheckBoxControl:chk_brushLibrary
-- edt_libraryName: RolloutControl:edt_libraryName in rollout:wallwormMatGen : EditTextControl:edt_libraryName
-- chk_decalLibrary: RolloutControl:chk_decalLibrary in rollout:wallwormMatGen : CheckBoxControl:chk_decalLibrary
-- chkMXS: RolloutControl:chkMXS in rollout:wallwormMatGen : CheckBoxControl:chkMXS
-- chk_recurse: RolloutControl:chk_recurse in rollout:wallwormMatGen : CheckBoxControl:chk_recurse
-- wallwormMatGen: Rollout:wallwormMatGen
-- edtFileFilters: RolloutControl:edtFileFilters in rollout:wallwormMatGen : EditTextControl:edtFileFilters
-- ------------------------------------------------------
-- [stack level: 6]
-- called from top-level
