[json.exception.type_error.304] cannot use at() with string

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Hello,

I am using Open Studio Application 3.2.1 with EnergyPlus 9.5.0. At the begginning of the simulation i receive this error.

[json.exception.type_error.304] cannot use at() with string

I found that the descritpion of the error is : The at() member functions can only be executed for certain JSON types.

I have removed all the systems and put the zones in ideal loads

How can I identify in my osm model the source of the error ?