Syntax errors on wrong line

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Summary

Since a plantuml-file is supposed to start with @plantuml, the line of the error within plantuml does not usually correspond to the line of the error in the file. Furthermore, there might be blank lines above that:

So the error line needs to be counted from below the @startuml keyword if there is one.

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@a1exsh could you give me a pointer how to fix this, too? ;)