[Koha] Koha login error

Dear sri, koha when logging in the following error is coming what should be done to fix this. n error has occurred!*Error 500*This message may have been caused by any of the following reasons: - You made use of an external link to an item that is no longer available - You followed an outdated link e.g. from a search engine or a bookmark - You tried to access a page that needs authentication - An internal link in the client is broken and the page does not exist What's next? - Use top menu bar to navigate to another part of Koha. - To report a broken link or any other issue, please contact the Koha administrator. Send email <masterlibrary%40mamcet.com>