[error] Client-only API called on the server side. Run client-only code in onMount, or conditionally

I everyone
I'm facing this error when try to deploy my website:

[error] Client-only API called on the server side. Run client-only code in onMount, or conditionally run client-only component with <Show>.

Already try to deploy in two places, without success.
Any idea how to identify what is causing that?