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FileDoesNotExistException - means that file specified as part of a configuration doesn't exist.
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MessageQueueException/SharedMemoryException - means that communication with ViZDoom's instance failed. Usually means a problem with permissions or system configuration.
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SignalException - means that a signal was cached by ViZDoom's instance.
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ViZDoomErrorException - means that an error in the ViZDoom engine occurred.
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ViZDoomIsNotRunningException - means that called method cannot be used when ViZDoom instance isn't running.
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ViZDoomUnexpectedExitException - means that ViZDoom's instance was closed/terminated/killed from the outside.
Most of the exceptions contain more information in "what()" message.