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I'm trying to set an icon for an item in Sitecore 8.2. When I click the More Icons button, I get the error message below.

More Icons

The parameter is not valid.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.ArgumentException: Parameter is not valid.

Sitecore error message

What's strange is that I have this site deployed to another environment and it's working fine there. It's only giving me this error on my local development machine. I think it might be a corrupt cached image file that's causing the error, but I don't know how to clear that cache out.

  • Clear /App_Data/MediaCache for media, also there is an icon cache at <webroot>/temp/IconCache - try clearing that too and restart IIS – Richard Seal Nov 7 '16 at 15:52
  • I deleted the IconCache folder and the MediaCache folder and that didn't help. I also deleted the .ZIP files from the /Website/sitecore/shell/Themes/Standard and copied them from the .ZIP file from Sitecore and that didn't seem to help either. – Kevin Nov 7 '16 at 16:12
  • The error comes from the gdiplus.dll so it's hard to say what's going wrong. I think it may fail to write the bitmap because access rights don't allow it. Since it's local, you could try to set full permissions to everyone on the web root folder. – Ruud van Falier Nov 7 '16 at 16:24
  • I'm pretty sure it's not a security issue. It is recreating the IconCache folder and starting to populate it as needed. But I did go ahead and reapplied security and that didn't help. And I gave "Everyone" full control and that didn't help. I just copied the IconCache folder and Themes folder from the environment that is working and it's still not working. – Kevin Nov 7 '16 at 18:49
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Apparently the problem was not in the IconCache folder, but rather the temp folder. I deleted everything from temp and it fixed the problem.

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