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FlexApp Error - The collection has been modified. The inventory operation might not be performed.

James Pratt
  • Created:
  • Updated:

Product: ProfileUnity-FlexApp

Product Version:  6.8.7GA & 6.8.7R2 Only - Fixed in 6.8.7 R2 HF1 and newer

Expiration: 365 days from publishing

Updated: April 30, 2025

 

Problem:

Virtual Disk will not mount, InvalidOperation, The collection has been modified. The inventory operation might not be performed. is shown in the DIA log:

2025-04-17 03:27:36.310 [1] INFO - Running module FlexAppDIA…
2025-04-17 03:27:38.981 [1] ERROR - Virtual Disk could not be mounted.. Exit code was: 31. Message was: A device connected to the system is not working.
2025-04-17 03:27:38.981 [1] WARN - a mount attempt using the system flag failed, subsequent mount attempts will not use this flag
2025-04-17 03:27:50.093 [7] ERROR - ReplayManager.ReplaNonJitCut failed to replay 'C:\FADIA-T\VHDW\2e85ec23d6a2f3c194d26d311a164c1d\child-Notepad++_20250312101124.vhdx', error 'InvalidOperationException' 'The collection has been modified. The inventory operation might not be performed.'
2025-04-17 03:28:08.936 [1] INFO - Writing to the event log Application - ProfileUnity Client.Net DIA

 

Symptoms:

VHDX Not Mounting, error in DIA log as above. 

Resolution:

1. Obtain the client configuration file:

  • Navigate using Explorer to your deployment share
  • Copy/Download client.net.zip to your local desktop or another temporary location
  • Extract the zip file to a temporary folder named client.net

2. Edit the configuration file

  • Open LwL.ProfileUnity.Client.exe.config using Notepad or Notepad++
  • Scroll to the bottom of the file and make the following change:
  • Change:
     <setting name="FlexAppNonJitCutReplayInParallel" serializeAs="String">
        <value>True</value>
    To:
     <setting name="FlexAppNonJitCutReplayInParallel" serializeAs="String">
        <value>False</value>
  • Change:
     <setting name="FilterParallelEvaluation" serializeAs="String">
        <value>True</value>
    To:
     <setting name="FilterParallelEvaluation" serializeAs="String">
        <value>False</value>
  • Change:
     <setting name="FlexAppBulkMountMaxGroupSize" serializeAs="String">
        <value>100</value>
    To:
     <setting name="FlexAppBulkMountMaxGroupSize" serializeAs="String">
        <value>1</value>
  • Save the modified configuration file LwL.ProfileUnity.Client.exe.config

    3. Create the new client.net.zip file:

    Select all files and folders in the temporary client.net folder
    Right-click and select 7-Zip → Add to archive:

    Picture1.png
  • Accept the 7zip defaults and name the file client.net.zip:

    Picture22.png
    • Verify the zip file structure: the files and folders should be at the root level (no extra "client.net" folder inside)
    • Example of how the zip should look after opening:

      Picture3.png

  • 4. Deploy the updated configuration

    • Rename the original file in the deployment share to client.net.zip.old (backup)
    • Copy your new client.net.zip to the deployment share to replace the original
    • Update any golden images with the same change, and/or reinstall the client tools from the deployment path so the updated client-tools use the new zip file.

 

 

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