Elements kit not importing

Hi, I have tried to import an elementor kit. But it’s not importing. after 98% it’s showing an error. Even some templates are imported without images. It’s mean no image is imported.
Please check the error code below:

Unexpected Error
Sorry there was an unexpected error from API call:

SyntaxError: Unexpected token < in JSON at position 0. <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"> <html><head> <title>500 Internal Server Error</title> </head><body> <h1>Internal Server Error</h1> <p>The server encountered an internal error or mis

Could be copyrighted images. Have you checked/changed the PHP configurations on the server? ( PHP time out, etc )