Shah,
ACP doesn't know if the moon is up or not. Only when you run ACP with ACP Scheduler does the system gain such intelligence and can begin to make automatic decisions on what plans to run based on object location in the sky, moon down or location in sky for avoidance, etc.
Under ACP Preferences | Observatory tab, make sure your latitude and longitude are accurate. While in Preferences, check under the Telescope tab that the min elevation is also correct. ACP uses this information along with local time to compute whether the target is 'reachable' in the sky. If its not, that's the error you'll receive.
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