Cannot drop a message with an ID less than 50,000.

Error Message:
Msg 15178, Level 16, State 1, Procedure sp_dropmessage, Line 25
Cannot drop a message with an ID less than 50,000.

Severity level:
16.

Description:
This error message appears when you try to drop a system-defined message with an ID less than 50,000.

Consequences:
The T-SQL statement can be parsed, but causes the error at runtime.

Resolution:
Error of the Severity level 16 are generated by the user and are corrigible by the user. The statement cannot be run this way. You can not drop a system-defined message.

Versions:
All versions of SQL Server.

Example(s):
EXEC sys.sp_dropmessage 0

Remarks:
In the above example we try to drop the message with ID 0. This raises the error.