You may get this exception when any general type error occur in NCache. For example when the required jar files are not available at their appropriate location or if you cannot connect to the target cache etc.
Workaround
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Run 'install.bat' file at least once before start using NCache Client API. This file is located at %INSTALL_DIR%/NCache/java/lib/.
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'installer.jar', 'NCActivate', 'NCRuntime.jar', 'NCSerialization.jar', 'NCClient.jar' and 'javaReg.properties' should also be present at the above mentioned location.