Cannot Access Business Rules in my Dynamics CRM Dev Environment - dynamics-crm

I'm having difficulties in creating / updating business rules. Every time I'm trying to create new Business Rules or Edit the Existing business rules. I'm getting an error without a error code. basically it's not letting me to look or create the business rules and sometimes even the processes(workflows) also.
I'm working on CRM 2016 on-premise (version-8.0.0.1088),I'm having a system Administrator's role. It's really tough to troubleshoot and find a solution for this issue has been struggling for a while with the issue.
I've imported an unmanaged solution recently. It's very annoying, spent a lot of time in researching but still no use, any help much appreciated!.
Error Log Details: (from Trace)
TargetInvocationException: Exception has been thrown by the target of an >invocation. ---> System.IO.FileNotFoundException: Could not load file or >assembly 'log4net, Version=1.2.15.0, Culture=neutral, >PublicKeyToken=669e0ddf0bb1aa2a' or one of its dependencies. The system cannot >find the file specified.

thanks to Federico Jousset who have promptly responded to my question. He has suggested me to enable the Trace log feature in CRM (on premise), which I wasn't aware of, and once done, it gave me reason why it was failing.

It looks like your custom dll deployed to dynamics crm is dependent on log4net, which is not found in server GAC/merged dll.

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This is a known limitation on plugins and custom workflow assemblies running in the sandbox environment.
ref: https://learn.microsoft.com/en-us/dynamics365/customer-engagement/developer/create-own-actions#watch-out-for-long-running-actions
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Does ExecuteMultipleRequest work in Outlook offline mode?
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