Trying to add dll that Jil uses to the database like to CLR

[johanaReza]

I'm trying to add a dll to my database (it's a class library project) that Jil uses to serialize and deserialize objects, but I get the following error:
Assembly 'Jil' references assembly 'sigil, version=4.7.0.0, culture=neutral, publickeytoken=2d06c3494341c8ab.', which is not present in the current database. SQL Server attempted to locate and automatically load the referenced assembly from the same location where referring assembly came from, but that operation has failed (reason: version, culture or public key mismatch). Please load the referenced assembly into the current database and retry your request. SQL1.sql
Update to the latest version, but neither.