I am getting the error: An unknown error occurred for each file in a folder when I try Update Asset Indexes. The folder is a local folder that is outside of webroot. The files just contain json data. I have looked through Craft log files and apache log files and cannot find anything. Any ideas?
I have tried the following from other questions with the same error message and none of these made an difference.
Deleted entire craft/storage/runtime/ folder
Made sure no record in table assetindex has null for dateModified column
Reset folder ownership