Error Install

[mafer0410]

Hello good afternoon, I have tried to install the PRTG Scheduler following the instructions, but I have two doubts:

1. The following error appears in the sensor.

XML: The returned XML does not match the expected schema. (code: PE233) - JSON: The returned JSON does not match the expected structure (Invalid JSON.). (code: PE231)

For what is this?

2. Where is the maintenance syntax entered?