Could you upload your analysis JSON? That message implies one of the test recordings is missing.
I haven’t used it before,this is my first time using this software.
It’s the file named sysid_data20230202-104819.json.
I have tried some times,but it showed the same situation.
something like this
sysid_data20230202-104819.json (99 Bytes)
Have you actually run the program on your robot?
Since you mentioned youre new to the tool (and as a general policy), I highly recommend reading the appropriate section of the docs in full before trying to use it. In this case, the appropriate section would be this: Introduction to System Identification — FIRST Robotics Competition documentation