Android Question label error

I have a label named lblMessage, which is the only label by that name in my app.
I did not know that labels can be made into an array or collection with different indexes (indices), and the properties of the label view does not show index as a property.

The code line with the error is:

The error I Get is:

Index was out of range. Must be non negative and less than the size of the collection. Parameter name: Index

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PK