80020005: Type mismatch at dispatchInvoke0

I am receiving a "type mismatch" from the dispatchInvoke0 method of
GenericStub. The full exception stack is:

org.jawin.COMException: 80020005: Type mismatch. at
org.jawin.marshal.GenericStub.dispatchInvoke0(Native Method) at
org.jawin.marshal.GenericStub.dispatchInvoke(GenericStub.java:201) at
org.jawin.DispatchPtr.invokeN(DispatchPtr.java:587) at
org.jawin.DispatchPtr.invokeN(DispatchPtr.java:555) at
com.ei.hali._CMacros.Item(_CMacros.java:178) at
com.ei.controller.CommandController.processRequest(CommandController.java:106)
at com.ei.controller.AbstractController.doGet(AbstractController.java:98) at
javax.servlet.http.HttpServlet.service(HttpServlet.java:126) at
javax.servlet.http.HttpServlet.service(HttpServlet.java:103) at
com.caucho.server.http.FilterChainServlet.doFilter(FilterChainServlet.java:96)
at com.caucho.server.http.Invocation.service(Invocation.java:315) at
com.caucho.server.http.HttpRequest.handleRequest(HttpRequest.java:253) at
com.caucho.server.http.HttpRequest.handleConnection(HttpRequest.java:170) at
com.caucho.server.TcpConnection.run(TcpConnection.java:139) at
java.lang.Thread.run(Thread.java:534)

To determine its cause, I figured I would pick the brains of those more
experienced with this application.

Any assistance with what causes this error, and corrections taken to resolve
it, would be greatly appreciated.

If more specifics are required, please let me know, and I will provide as
much detail as I can.

Thanks.