that is because you use the same port for minecraft as for dynmap, which is not allowed. use another port for dynmap. your host might be able to open a secondary port.

I created a server on a hosting computer there is no port and use another one

If your host can't provide you with another port you can use, then you can't use dynmap, sorry. There are no workarounds to that problem

Closing - happy to reopen, but sounds like you need your host to open a second port for you