Hi panda,
I am not sure your system upgraded or not / issue with database.
because your error indicating delete from pakdatabuf ,which is related to DB.
Kindly check this 2 notes & see correction .
1300463 - Prevent the CX_SY_OPEN_SQL_DB exception.
1629112 - Dump: IMPORT_FORMAT_ERROR in SAPLPA_PACKAGE_SERVICES
It may helps.
Thanks
Gourav.