VelocityServlet : Error processing the template

org.apache.velocity.exception.MethodInvocationException: Invocation of method 'get' in  class java.util.Vector threw exception class java.lang.ArrayIndexOutOfBoundsException : Array index out of range: 0
org.apache.velocity.exception.MethodInvocationException: Invocation of method 'get' in  class java.util.Vector threw exception class java.lang.ArrayIndexOutOfBoundsException : Array index out of range: 0
	at org.apache.velocity.runtime.parser.node.ASTMethod.execute(ASTMethod.java:309)
	at org.apache.velocity.runtime.parser.node.ASTReference.execute(ASTReference.java:207)
	at org.apache.velocity.runtime.parser.node.ASTReference.render(ASTReference.java:250)
	at org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.java:271)
	at org.apache.velocity.Template.merge(Template.java:296)
	at org.apache.velocity.servlet.VelocityServlet.mergeTemplate(VelocityServlet.java:448)
	at org.apache.velocity.servlet.VelocityServlet.doRequest(VelocityServlet.java:387)
	at org.apache.velocity.servlet.VelocityServlet.doGet(VelocityServlet.java:333)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
	at com.broadvision.servlet.ServletContainer.service(ServletContainer.java:483)
	at com.broadvision.servlet.ServletContainer.processRequest(ServletContainer.java:427)
	at com.broadvision.servlet.ServletContextContainer.processRequest(ServletContextContainer.java:685)
	at com.broadvision.servlet.ServletContextContainer.service(ServletContextContainer.java:647)
	at com.broadvision.servlet.HostContainer.service(HostContainer.java:245)
	at com.broadvision.servlet.BVServletEngine.service(BVServletEngine.java:201)
	at com.broadvision.servlet.EntryPoint.service(EntryPoint.java:109)
	at sun.reflect.GeneratedMethodAccessor7.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:324)
	at com.broadvision.servlet.BVServletConnector.service(BVServletConnector.java:117)