A row of a table that this statement needs is not accessible because it has been locked. Check the accompanying ISAM error code for more detailed information. It will probably be -107, -113, -134, -143, -144, or -154. Each notes a slightly different relationship between your program and the other user's program. You can prevent most, but not all, occurrences of this error with SET LOCK MODE TO WAIT.
For database servers prior to Version 4.1, this error message is produced in conjunction with the UPDATE and the DELETE WHERE CURRENT OF statements only. In Version 6.0, this error message is no longer used.