Thank you for your response. We have checked about the plugin cache which you asked for.
Also, as you said to check our error logs, we have checked it in our hosting panel.
Nothing is visible in the error log folder I mean no error is there in it. But when I open the WP-QDMIN folder it shows 3 folders for error logs, out of which 2 are opening but one with the largest memory is not opening.
I am attaching a video recorded for the error in the private content, please do check it once and let me know what is the exact error and how can we solve it.
Also, if you want we can share the access of our hosting panel with you to check exact errors.
One standard license is valid only for 1 project. Running multiple projects on a single license is a copyright violation.