CCP4: database access failure

When opening the CCP4 program, it alerts "DatabaseLock", "Each project database file can only be opened by one CCP4I at a time." like below:


When running the project, it alerts "Database Access Failure", "This instance of CCP4i no longer has control of the current database." like below:


Over the whole internet, there is only one page giving suggestion to solve this problem: delete ccp4.LOCK. However, it is not helpful by deleting the similar file called "database.LOCK".

The helpful solution is: Delete the folder "CCP4_DATABASE", which is in the project folder and contains the file "database.LOCK". The program shall create a new one automatically and every thing may be fine.

solved by x4base.