Maya 2018.2 warning

[lincoln85]

What does the warnings mean? And how to avoid them?Thanks.
file -f -new;
// untitled //
commandPort -securityWarning -name commandportDefault;
onSetCurrentLayout "Maya Classic";
// Warning: file: C:\Users\lfn3466\Documents\maya\2018\prefs\filePathEditorRegistryPrefs.mel line 4: filePathEditor: Attribute 'aiImage.filename' is invalid or is not designated 'usedAsFilename'. //
// Warning: file: C:\Users\lfn3466\Documents\maya\2018\prefs\filePathEditorRegistryPrefs.mel line 5: filePathEditor: Attribute 'aiPhotometricLight.aiFilename' is invalid or is not designated 'usedAsFilename'. //
// Warning: file: C:\Users\lfn3466\Documents\maya\2018\prefs\filePathEditorRegistryPrefs.mel line 6: filePathEditor: Attribute 'aiStandIn.dso' is invalid or is not designated 'usedAsFilename'. //
// Warning: file: C:\Users\lfn3466\Documents\maya\2018\prefs\filePathEditorRegistryPrefs.mel line 7: filePathEditor: Attribute 'aiVolume.filename' is invalid or is not designated 'usedAsFilename'. //
// AbcExport v1.0 using Alembic 1.5.8 (built Jul 13 2016 18:28:45)
# pymel.core : Updating pymel with pre-loaded plugins: invertShape, mayaHIK, GamePipeline, CloudImportExport, curveWarp, tiffFloatReader, MASH, poseInterpolator, bifrostvisplugin, ATFPlugin, hairPhysicalShader, ikSpringSolver, ik2Bsolver, xgenToolkit, AbcExport, retargeterNodes, gameFbxExporter, VectorRender, OpenEXRLoader, lookdevKit, Unfold3D, Type, modelingToolkit, deformerEvaluator, renderSetup, GPUBuiltInDeformer, fbxmaya
evalDeferred "shaderBallRendererMenuUpdate";
// Warning: line 1: filePathEditor: Attribute 'aiStandIn.dso' and label 'Standin' have been saved already. //
// Warning: line 1: filePathEditor: Attribute 'aiVolume.filename' and label 'VDB' have been saved already. //
// Warning: line 1: filePathEditor: Attribute 'aiImage.filename' and label 'Image' have been saved already. //
// Warning: line 1: filePathEditor: Attribute 'aiPhotometricLight.aiFilename' and label 'IES' have been saved already. //
import arnold
// Successfully imported python module 'arnold'
import mtoa
// Successfully imported python module 'mtoa'
import mtoa.cmds.registerArnoldRenderer;mtoa.cmds.registerArnoldRenderer.registerArnoldRenderer()
Maya 2018 importing module pymel 1.0.10 (C:\Program Files\Autodesk\Maya2018\Python\lib\site-packages\pymel\__init__.pyc)
// Successfully registered renderer 'arnold'
// Warning: file: C:/Program Files/Autodesk/Maya2018/scripts/startup/autoLoadPlugin.mel line 35: Loading plug-in "mtoa" has resulted in changes to the scene that may need to be saved. //
// AbcImport v1.0 using Alembic 1.5.8 (built Jul 13 2016 18:28:45) //
updateRendererUI;
updateRendererUI;

[Anonymous]

You've probably turned off the autoload setting for the mtoa plugin. That plugin registers some attributes with Maya's filePathEditor but neglects to deregister them when it is unloaded, so they end up being saved in your preferences. The next time you start up Maya those preferences are reloaded but now the attributes cannot be found because the mtoa plugin is not loaded.

The warnings are harmless. You can get rid of them by turning on autoload for the mtoa plugin, or by complaining to Solidangle/Autodesk until they fix it.

[Anonymous]

I'm getting similar errors on Maya 2018.6 - the errors point to line 4, 5, and 7, but not 6. Plugin-Manager has mtoa.bundle set to load and auto-load

file -f -new;
// untitled // 
commandPort -securityWarning -name commandportDefault;
onSetCurrentLayout "Maya Classic";
// AbcExport v1.0 using Alembic 1.7.5 (built Feb  7 2018 13:51:52)
evalDeferred "shaderBallRendererMenuUpdate";
// Warning: file: /Users/username/Library/Preferences/Autodesk/maya/2018/prefs/filePathEditorRegistryPrefs.mel line 4: filePathEditor: Attribute 'aiImage.filename' is invalid or is not designated 'usedAsFilename'. // 
// Warning: file: /Users/username/Library/Preferences/Autodesk/maya/2018/prefs/filePathEditorRegistryPrefs.mel line 5: filePathEditor: Attribute 'aiPhotometricLight.aiFilename' is invalid or is not designated 'usedAsFilename'. // 
// Warning: file: /Users/username/Library/Preferences/Autodesk/maya/2018/prefs/filePathEditorRegistryPrefs.mel line 7: filePathEditor: Attribute 'aiVolume.filename' is invalid or is not designated 'usedAsFilename'. // 
// Warning: line 1: filePathEditor: Attribute 'aiVolume.filename' and label 'VDB' have been saved already. // 
// Warning: line 1: filePathEditor: Attribute 'aiImage.filename' and label 'Image' have been saved already. // 
// Warning: line 1: filePathEditor: Attribute 'aiPhotometricLight.aiFilename' and label 'IES' have been saved already. // 
import arnold
// Successfully imported python module 'arnold'
import mtoa
// Successfully imported python module 'mtoa'
import mtoa.cmds.registerArnoldRenderer;mtoa.cmds.registerArnoldRenderer.registerArnoldRenderer()
// Successfully registered renderer 'arnold'
updateRenderOverride;
// Warning: file: /Applications/Autodesk/maya2018/Maya.app/Contents/scripts/startup/autoLoadPlugin.mel line 35: Loading plug-in "mtoa" has resulted in changes to the scene that may need to be saved. // 
// AbcImport v1.0 using Alembic 1.7.5 (built Feb  7 2018 13:51:52)
updateRendererUI;
updateRendererUI;
// AbcImport v1.0 using Alembic 1.7.5 (built Feb  7 2018 13:51:52)
updateRendererUI;
updateRendererUI;