Output argument "signifRxns" (and maybe others) not assigned during call to "mapExpressionToReactions"

[Ananas-bio]

Hello, I have been playing around the COBRA toolbox and Matlab on a whole and found myself trying to save the mapped expressions on a table. Beyond not being able to get a table with the expression values associated with the reactions, whenever I try to do the following call:

[expressionRxns, parsedGPR, gene_used, signifRxns] = mapExpressionToReactions(model, expressionData, 'minSum')

it gives me:

Output argument "signifRxns" (and maybe others) not assigned during call to "mapExpressionToReactions".

I can't tell why it gives me so when, as far as I can tell, I correctly copy-pasted the USAGE from the actual script of the function, and as far as I can tell it's not an issue for other people from the issues I have been looking at?

I'm using Matlab R2018a on Windows 101

Thank you.