Abap proxy finish with cx_ai_system_fault error

Hi,

I've trying to develop an abap proxy --> PI --> file scenario.

However, when I try to test the created proxy in trans SPROXY error cx_ai_system_fault is returned.

Connection test is ok. Reports SPROX_CHECK_IFR_ADDRESS, SPROX_CHECK_HTTP_COMMUNICATION, SPROX_CHECK_IFR_RESPONSE doesn't return any error.

What could be the problem?

Thanks, in advance.

Carme.