Failed to undefined folder. Folder not found

My object library folder seems to bug out, I've placed some items in it, and now it just doesn't open, and this pop up in a warning pop up window :" Failed to undefined folder. Folder not found." Help would be welcome, because I don't know what to do other than to reupload all the items.

I'm sorry to hear that you're having issues with the site. Could you please carefully work through the first three steps of our guide to Solving Technical Issues ? Step 1: Make sure to use the right browser Please check if these issues persist when using both Chrome and Firefox. Step 2: Ensure that there are no extensions/addons interfering with Roll20 Please disable all add-ons/extensions and anti-virus programs. Step 3: Clear your cache If none of the above succeeds, please thoroughly work through Step 4 . (Don't forget the complete Console Log!) Thank you!