Invalid Record List Indexer error is issued in the following situations:
'Record List' variable indexer must be an 'Integer'
You are indexing your List using a number that is not an Integer.
Check the data type of your index because the
operator expects an Integer value.
Only 'Record List' elements can be indexed
you are indexing an element that is not a List.
Change the element data type because the
operator can only be used with Lists.
Double-click on the error line to take you directly to the element where this situation was detected.