Installation failed; reason - load on module failed, failed to load security policy

This error is valid for version R75.20, R75.30, R75.40

 Installation failed; reason - load on module failed, failed to load security policy

You are getting this error , because of defining new URL site.

To solve this issue;

Open smartdashboard ;

Application & URL Filtering --> Application / Sites --> Edit the custom application/site that you have created and Uncheck the URLs are defined as Regular expression.

Try to install policy again.
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