Hi Jalal,
In this issue, you need to contact with your Hosting Provider or WHMCS support. This is because, we have provided just an custom template for front-end view only of WHMCS.
So, it’s not possible to hang the WHMCS admin for our template.
Please Note: mainly, our template is an HTML template and we just provided support by customizing WHMCS header and footer and color based on our template for FREE of cost with our HTML template.
Best Regards,
ThemeLooks Support Team