Why do I receive an 'Invalid input argument of type 'double'. Input must be a structure or a Java or COM object' error while loading data in a simbiology fit program?

I deviced a kinetic model using simbiology, simulated it and everything worked fine. Then I loaded a data set from excel containing three columns: ID, Time and concentration. I set ID as group, Time as independent and concentration as depended variables. But when I run the program it says

Invalid input argument of type 'double'. Input must be a structure or a Java or COM object.

I've also tried loading the data directly from the workspace and it gave the same error.

I converted the data to a structure and that is not listed as a valid input type while importing a dataset. I checked online tutorials and everyone seems to be able to load 'double' types.

The reaction is just A+B-->null

And dB/dt = -k*[B] and A is constant

[Fulden Buyukozturk]

Are you running R2021b and is your dataset has only one group? If so, this is likely a known bug that affects datasets with no group or one group.

You could use the command-line interface fitprogram instead of the app or run the app in R2021a. Sorry for the inconvenience.

[Archishman Ghosh]

Yes, I am running on R2021b. Which version would this bug not appear in? Perhaps I can rollback?

[Archishman Ghosh]

OK 2021a worked. It was a bug.

Answer 1

[Fulden Buyukozturk]

Are you running R2021b and is your dataset has only one group? If so, this is likely a known bug with the app that affects datasets with no group or one group.

You could use the command-line interface fitproblem instead of the app or run the app in R2021a. Sorry for the inconvenience.