Quick answer: The SSIS CS2001 Missing AssemblyAttributes.cs error can occur when a Script Task cannot compile its generated code on the server. A common cause is insufficient access to the Windows temporary folder used during script compilation. Verify the SQL Server Agent/SSIS execution account has the required temporary-folder access, then rebuild the script and redeploy the package.
The following error may appear when an SSIS package runs successfully in development but fails after deployment:
Error: The binary code for the script is not found. Please open the script in the designer by clicking Edit Script button and make sure it builds successfully.
Fix the CS2001 AssemblyAttributes.cs error
1. On the server where the SSIS package executes, check the permissions on C:\Windows\Temp\.
2. Identify the Windows account that actually runs the package, such as the SQL Server Agent service account or the account used by your SSIS execution mechanism.
3. Make sure that account has sufficient permission to create and modify temporary files in the required temporary directory. Avoid granting broad permissions such as ownership or full control to all users.
4. Open the SSIS project in SSDT/Visual Studio, open the Script Task, select Edit Script, and confirm the script builds successfully.
5. Rebuild the SSIS project, redeploy the updated project to SSISDB, and run the package again.
If the problem continues, check the package execution account, Windows event logs, and the SSIS execution logs for additional permission or script-compilation errors.
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