not a bug, just don't creat too many files in one project, devide files to more projects

it does it when I am trying to create a new footprint.

You import too many kicad libs, that seems all exist at system libs, at now we provide 2000 part per user, we thought that one user will not need to creat too many parts, please remove some don't need parts

@bigb23 It's a cryptic error and a result of too many User library items in the database, which apparently is subject to an unpublished 2000 user library item "limit".. It does seem that the error should at least explain a little bit about what "Limit" has been exceeded and perhaps even why it has been exceeded. Also the Support messages that simply say "Don't import too many" does little to fix your problem since it is not your problem for designing limits into the program. Delete library Footprints - To allow you to save a footprint, You need to open the Footprint Library by clicking on the left side pane labelled "Library". The Library form will open up and there are a few search filters at the top of the form. Choose "EasyEDA",  "Footprint" and "Workspace", No need to specify a keyword. Many items will show in the window with the owner as your login Name. Simply delete an unneeded footprint by right clicking on the name and choosing "Delete" from the dropdown menu, then confirm delete by clicking "OK". Now hit cancel at the bottom and go back to the window where you are creating your new Footprint then try to save it. You should now be able to save a footprint without the error message. Also notice that if you ever create and try to save a new symbol, you might also get the same "Exceed Limit" error message, you delete symbols in the same manner as footprints, just simply change the filter to "Symbol" and Delete from the list in the same manner.