What means 'JSON path "" is an invalid name'? [SOLVED]

Resolved

I am configuring a POST API CALL. The test is OK, I can receive the answer. But when trying to save the configuration, I receive an error: 'JSON path "" is an invalid name'


What means that? If I remove the " from String values, I receive another error. I am confused.

[SOLVED} But I don´t know why...

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