Explicit conversion from data type %ls to %ls is not allowed.

Error Message:
Msg 529, Level 16, State 2, Line 3
Explicit conversion from data type %ls to %ls is not allowed.

Severity level:
16.

Description:
This error message appears when you try to convert from one data type into another, but this conversion is not allowed.

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 can be fixed by the SQL Server user. The statement cannot be run this way. You can not perform this conversion.

Versions:
All versions of SQL Server.

Example(s):
DECLARE @p1 int;

SELECT CAST(@p1 AS uniqueidentifier);

Remarks:
In the above example we try to convert a value of data type int to uniqueidentifier. Since this conversion is not allowed explicitly, the error is raised. A table of all the allowed implicit and explicit converions can be found in Books Online.




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