byref argument type mismatch error in function

[Aphis]

Hello,

I have this function that changes a sting using another function (scoateA) which is tested and works fine.
When i call this function i get the byref argument type mismatch error and it highlights the line with the function name.

So here it is:

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Any ideas?

[Aphis]

solved, i had to define the 'i' i used in the for loop.