evaluate(file) inside script fails

Hello! I am calling embedded groovy from servlet. Call to
evaluate(new File(scriptFile)) causes exception in file scriptFile:
java.lang.ClassFormatError: Invalid index 1 in LocalVariableTable

Problem is fixed with extra println but I would like to take that
println away.

----------------- servlet
groovy.lang.Binding binding = new groovy.lang.Binding(data);
GroovyShell shell = new GroovyShell(binding); 
shell.evaluate( new File(fileName) );
----------------- script
evaluate(new File(scriptFile));
----------------- scriptFile
println "abc"; // extra println
a="123";



                
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