M6.20 : unable to save the Data Shape



I create the Data Shape, with the 3 fields.
When I want to save it an error message says :

save failed, status: Internal Server Error message: Unable To Convert From org.json.JSONObject$Null to NUMBER

Any idea where this comes from ?

Thank you,


Hello @j441,

Could you please tell me which version of ThingWorx are you using? Is it the Academic version, featured in the IoT Modeling 1 with ThingWorx course?

Thank you,
The IoTU Support Team