trying to select title block families by sheet number to change parameters
What is the error from the String.ToNumber block? 
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And the error at the filter by book mask as well.
Likely it can’t check if the results are greater than a number as the string to number fails resulting in a null.
Can you check to see if there is a null in the results of the && node by wiring it into a list.unique node?
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Thanks man, just figured out it was nulls, got rid of it by using a string contains A to make sure its all the right sheet numbers
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The parameter value for Sheetnumber IS a string.
You can leave it as it is, no need to convert.
Marcel