BI Java STK Tutorial 1 Error

Hi,

I am new to the Java development.  I copied BI Java STK Tutorial 1.  When I run the program, I received following error message:

com.sap.ip.bi.sdk.exception.BIRuntimeException: System error: null

     at com.sap.ip.bi.sdk.samples.servlet.MinimalServletContainer.executeServlet(MinimalServletContainer.java:57)

     at com.sap.ip.bi.sdk.samples.servlet.MinimalServletContainer.executeServlet(MinimalServletContainer.java:35)

     at com.sap.ip.bi.sdk.samples.Tutorial_1.main(Tutorial_1.java:285)

I also have tested the URL in BW server with tcode SICF  without problem.

Ivan