solve errors and make installation inside cpanel

The problem is: my developer made an application using next.js. In local work. If install in Vercel server work. When the developer make the installation inside my cpanel don't work. The reason is that the backend is made in php and frontend in next js. This create problem on cpanel (pheraps next.js isn' t compatible with cpanel. Infact work inside Vercel).
What is necessary made?: 1. solve the errors regard the nextks (using also other framework) and other (backend - front end) to work inside cpanel; 2. install the code changed inside my cpanel using any desk