Sometimes even a “known good“ application, such as a sample project, does not run successfully. The problem is usually your environment.
Some demonstrations require specific setup and instructions. For example, if a sample uses web services and you are behind a firewall, you must configure the emulator’s proxy server settings or web access will fail. See Configuring the Web Browser and Proxy Settings.
If an application must run over the air (OTA), the SDK automatically installs it in the device instance.
MIDlet Suites use runMIDlet to perform the installation.
Consider configuring your antivirus software to exclude runMidlet from checking.