if I would be you, I would use stripe instead of paypal directly
if you still want to only use paypal, then more information is needed. "gets an error" is not very helpful

Unfortunately, we need more information regarding this matter, such as tax ID, etc.

Are there any steps in installing Paypal, so that I can follow it without any errors, I mean with the correct installation?

@B33fb0n3 this is the error