CSV Validator UI - Clicking “Validate” without selecting any file, gives you a vague “java.io.IOException: Is a directory” error

[techncl]

When you click “Validate” without selecting any file, you get “java.io.IOException: Is a directory” in the output. This error:

1. does not tell you which of the 2 text boxes has the error
2. might be vague for a normal person
3. could be deceiving
4. doesn’t clear when you change what’s in the text box

[sparkhi]

Might be easy to keep the "validate" button disabled if the text boxes are not populated.

[techncl]

That sounds like a good idea.