<p>Hello.</p>
<p>I created report with cascade parameter. And I wanted the parameter to be choosen from tree like list. </p>
<p>So first of all I made list of values (LOV) with tree definition. </p>
<p>Then I created analythical driver with string data type. I connected it with right LOV and choosed "select from tree" option. After those steps I made report and linked it with my driver.</p>
<p>When I am launching report the tree is displayed properly. I can choose right option, but when I am executing it, the blank page shows up. </p>
<p>I am getting this error:</p>
<div>AM org.eclipse.birt.report.engine.api.impl.EngineTask validateParameters</div>
<div>SEVERE: Required parameter cityyyy is not set.</div>
<div>org.eclipse.birt.report.engine.api.impl.ParameterValidationException: Required parameter cityyyy is not set.</div>
<p>Could anyone please help me?</p>
