FX Fault tolerant

Hello
I am using the E2 studio Version: 5.3.1.002, the ssp versión is 1.2.2 and also the IAR Compiler.

When using the fault tolerant service in FileX, do I have to make the call to the funtion 'UINT fx_fault_tolerant_enable(FX_MEDIA *media_ptr, VOID *memory_buffer, UINT memory_size);'?

I thought that the system was making that call it self. But  if I make a search in the code to see if it's done I can't find it. I can only see the function definition.

In the FileX user guide versión 5, page 243 saids: 'At run time, application starts fault tolerant service by calling fx_fault_tolerant_enable() immediately after the call
to fx_media_open.'