Create Assembly Error during installation

Hello,
I am newbie, came across sqlwatch through dbatools.io. I am trying to install sqlwatch on my db server SQL 2016 version. I keep getting Error related to Assembly. Any tips on how to fix it ?

Below is exact error message:

Could not deploy package.
Warning SQL72038: The object [SQLWATCH_blockers] already exists in database with a different definition and will not be altered.
Warning SQL72038: The object [SQLWATCH_long_queries] already exists in database with a different definition and will not be altered.
Warning SQL72038: The object [SQLWATCH_waits] already exists in database with a different definition and will not be altered.
Error SQL72014: .Net SqlClient Data Provider: Msg 15404, Level 16, State 19, Line 1 Could not obtain information about Windows NT group/user ‘YYY\XXXX’, error code 0x5.
Error SQL72045: Script execution error. The executed script:
CREATE ASSEMBLY [SqlWatchDatabase]
AUTHORIZATION [dbo]
FROM 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
(Microsoft.SqlServer.Dac)

WHEN i run it in SSMS, i get this error:

Msg 6544, Level 16, State 1, Line 1
CREATE ASSEMBLY for assembly ‘SqlWatchDatabase’ failed because assembly ‘SqlWatchDatabase’ is malformed or not a pure .NET assembly.
Unverifiable PE Header/native stub.

All things SQLWATCH

Nevermind I fixed the error.
Created Assembly from GUI, not T-SQL script.
Ran powershell command after it.
Using power BI to view dashboard, impressive tool so far!