Re: How to compare all rows of a sharepoint list in powerapps
Hi @glucero1975 - The error you have forwarded seems to only be related to the combo box - If you just want to view the items chosen in that field as a joined string in the comparison view, just use the label with the formula I gave you.
It should work as is, but to troubleshoot can you check to make sure multiselections have been made in the record you collected?
Also, can you go to View\collections and click into the nested table in your collection to reveal the contents of that nested table (i.e. your selected items). For example in the following scenario, I have clicked through in to view the contents of my multiple selection in a choice column called 'ChoiceMulti' within my collection, 'colTESTING'

You can see the header is 'Value', so when I added the following code into the label in the gallery row:

.....
I got the following result in the label:

Is the header in your nested table called 'Value' or is it something else?