Invalid Fromcode Throws an Exception

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We should improve this in four stages:

1. Have a general error
2. Show which line triggered the error
3. Offer hints
4. Show all errors, not just the first one

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With the lastet release we have a general error and we show the line that triggered the error. This works for simple cases for now and it only breaks on the first syntax error found.

But it's a start.