I am getting wrong error in login page. This error should not come in login page. "Error! You don't have any zip files to import Knowledge Articles under your Salesforce Org."

@Ranajit Paul - The error "You don't have any zip files to import Knowledge Articles under your Salesforce Org" should not appear on the login page. This is a Data Management import tool error, not a login error, and its appearance during login suggests a misconfiguration, custom login flow, or a bug in a managed package or custom Visualforce/Lightning component

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Recommended Actions 

1. Check Custom Login Flows: Review any custom login pages, flows, or SSO configurations that might execute Apex or Visualforce logic.
2. Inspect Custom Code: Look for triggers, controllers, or scripts that reference Knowledge objects or import utilities during user authentication.
3. Review Debug Logs: Enable debug logs for a login attempt to trace where the error originates.
4. Contact Salesforce Support: If no custom code is involved, this may be a platform bug requiring support intervention.