I have installed an app files_reader but later found that it was not compatible with my owncloud version. so I uninstalled it & removed the app.
Later own cloud started showing this error message:
“There were problems with the code integrity check. More information…”.
After checking then I found this :
[files_reader] => Array
[FILE_MISSING] => Array
[js/lib/Blob.js] => Array
[expected] => b0c7760f8b8365d39baf3a6320c2259660cadc5a4a877f35ef212ccfaee645a48ac6b754536d716539841c62a96f2b5036fe1087a0cb3c4b4c6b6fa34d406021
10.4.1 (stable) (see ownCloud admin page)