Error "Could not load file or assembly 'System.Runtime.CompilerServices.Unsafe..." when logging into CCH Axcess™.

  • Article Type:
  • Problem Resolution
  • Last Modified:
  • 11/05/2022


User experiences an error when logging into CCH Axcess™.

Full Error Message

"Could not load file or assembly "System.Runtime.CompilerServices.Unsafe, Version=, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified."


  • CCH Axcess
  • CCH Axcess Tax 


This issue is caused by missing files on some computers after updating CCH Axcess. Computers where CCH Axcess 2020-4.2 (or earlier) is currently installed may experience this issue after installing updates. For help locating such computers, see the article How do I identify computers missing CCH Axcess updates and ensure that CCH Axcess is always up-to-date?


Additional Information


  Solution Tools
 Solution Id 000240100/Error-Could-not-load-file-or-assembly-System-Runtime-CompilerServices-Unsafe-when-logging-into-CCH-Axcess
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