The server may be running out of resources, or the assembly may not be trusted with PERMISSION_SET = EXTERNAL_ACCESS or UNSAFE.

Error :
An error occurred in the Microsoft .NET Framework while trying to load assembly id 65554. The server may be running out of resources, or the assembly may not be trusted with PERMISSION_SET = EXTERNAL_ACCESS or UNSAFE.

Solution 1: KB Article
https://support.microsoft.com/en-us/kb/918040

Solution 2: Change the Permission Set : External

While doing this faced the below error :

ERROR: 
The database owner SID recorded in the master database differs from the database owner SID recorded in database
To check who is the owner listed in the master database run the following:

SELECT  SD.[SID]
       ,SL.Name as [LoginName]
  FROM  master..sysdatabases SD inner join master..syslogins SL
    on  SD.SID = SL.SID
 Where  SD.Name = ''

To correct this issue, run the following command:

Alter Authorization on Database:: to []

Once done set the required settings on the properties of Assembly.