Error Server SOAP

Good morning, this message comes to me in all the API methods that I am going to test.
could you help me…

Se esperaba el elemento final ‘Fault’ del espacio de nombres ‘http://schemas.xmlsoap.org/soap/envelope/’. Se encontró elemento ‘SOAP-ENV:detail’ del espacio de nombres ‘http://schemas.xmlsoap.org/soap/envelope/’.

Can you post a snippet of the code you are using?