Groovy Error: Unable to resolve class internal.GlobalVariable

Ah by the way, please double check yourProject.project file’s content within your project folder to see if these lines are available or not?

	<buildSpec>
		<buildCommand>
			<name>org.eclipse.jdt.core.javabuilder</name>
			<arguments>
			</arguments>
		</buildCommand>
	</buildSpec>

If there are no sight of its, then please add it after tag and before tag, e.g:

<?xml version="1.0" encoding="UTF-8"?>
<projectDescription>
	<name>E%%WebService%Sample Web Services Testing Project.prj</name>
	<comment></comment>
	<projects>
	</projects>
	<buildSpec>
		<buildCommand>
			<name>org.eclipse.jdt.core.javabuilder</name>
			<arguments>
			</arguments>
		</buildCommand>
	</buildSpec>
	<natures>
		<nature>org.eclipse.jdt.groovy.core.groovyNature</nature>
		<nature>org.eclipse.jdt.core.javanature</nature>
	</natures>
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