Ever came across an error in KDE saying “The trash has reached its maximum size! Cleanup the trash manually.” ?
First check the metadata file from the trash folder to see if the size is consistent with its content.
If it’s not, then do:
rm -rf ~/.local/share/Trash/*
This will remove the following from the trash folder:
Next time you delete something the above file & folders will be re-created & the problem should be solved.