SharePoint list grid view doesn't say what error is
I had a large document library that used files as the key. My file names were formatted as a date followed by a short description. I decided to move the date into a separate column so I could sort based on the date. I created the new column and then went into grid view to manually add all of the dates to the new column and remove them from the file names. When I went to exit grid view it told me I had to fix errors but it didn't in any way tell me what the errors were. It did tell me which rows the errors were on but it wasn't obvious what the problem was until I exited grid view without saving my changes and went to change the filenames manually and it pointed out that it was a duplicate file name once the date was removed. Can someone please add a description of what the error is or make it more obvious about how to find it? Thanks.