Need help with Error Handling

For the purpose of learning error handling in AppInventor2. 

I am trying to read non-existed file. 

The If Block is not working. No error message. 

Can someone please tell me what's wrong with my program blocks? Thanks.

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remove that if condition to first find out the errorNumber

then add an if statement like this

if errorNumber = 2101 (assuming the errorNumber is 2101)

then...

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Let's say a Button click may produce more than one error, may be 5 errors.
I do not want to use 'if, elseif, ..., else block' to deal with every individual error number.
Instead, I want to use the Button component for all the errors caused by the same button, issuing the same message.
If 'get component' = 'ButtonRead"; for example
doesn't seem to work. I tried also 'functionname', it is not working either
If 'functionname' = 'procedureRead"; for example
Please help again. Thanks.

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It now works.
My solution is
If  'functionname' = 'ReadFrom'

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