Bug 207258 Error exception message in type validation of multi-value parameters
If there is any exception in type validation of multi-value parameter, we will always get following error message: The type of parameter "NewParameter" is expected as "Object[]", not "Array".. This message is incorrect. Please replace the "Array" with the correct value type.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/api/impl/EngineTask.java
* the execution context
	 */
	protected ExecutionContext executionContext;
	/**
	 * task identifier. Could be used for logging
	 */
	protected int taskID;
	protected IReportRunnable runnable;
	/**
	 * options used to render the report design.
	 */
	protected IRenderOption renderOptions;
	/**
	 * emitter id
	 */
	protected String emitterID;
	/**
	 * does the parameter has been changed by the user.
	 */
	protected boolean parameterChanged = true;
	/**
	 * The parameter values that the caller has set explicitly
	 */
	protected HashMap inputValues = new HashMap( );
	/**
	 * The parameter values that will be used to run the report. It is a merged
	 * map between the input value and the default values.
	 */
	protected HashMap runValues = new HashMap( );
	/**