Why does exit throw an error?

Error using exit
Some kind of I/O error occurred when accessing database
/var/folders/1c/p7c0w2dd0275_20nq4yjp1g00000gn/T/83f8-7e7e-f0e3-77f8.dmr.
(disk I/O error)

Had to force quit the application.

[Jan]

"Disl I/O error" sounds like checking the disk is the next step. When does the error occur? Why is the mentioned data base accessed? Do you have pending requests to this database? Which Matlab version do you use? Which software use the mentioned dmr file?