Deploy error SQL01268: .Net SqlClient Data Provider: Msg 10327, Level 14, State 1, Line 1 CREATE ASSEMBLY for assembly '' failed because assembly '' is not authorized for PERMISSION_SET = EXTERNAL_ACCESS. The assembly is authorized when either of the following is true: the database owner (DBO) has EXTERNAL ACCESS ASSEMBLY permission and the database has the TRUSTWORTHY database property on; or the assembly is signed with a certificate or an asymmetric key that has a corresponding login with EXTERNAL ACCESS ASSEMBLY permission.

When we will deploy a CLR objects like CLR stored procedures, CLR data types etc we may get error message like:

Deploy error SQL01268: .Net SqlClient Data Provider: Msg 10327, Level 14, State 1, Line 1 CREATE ASSEMBLY for assembly '' failed because assembly '' is not authorized for PERMISSION_SET = EXTERNAL_ACCESS.  The assembly is authorized when either of the following is true: the database owner (DBO) has EXTERNAL ACCESS ASSEMBLY permission and the database has the TRUSTWORTHY database property on; or the assembly is signed with a certificate or an asymmetric key that has a corresponding login with EXTERNAL ACCESS ASSEMBLY permission.

Solution:

ALTER DATABASE SampleDB SET TRUSTWORTHY ON

EXEC dbo.sp_changedbowner @loginame = N'sa', @map = false

Note: Replace the SampleDB by your database name.