I unable to view from my Calileo F1100 x 102 mm Catadioptirc

Since you can focus on trees during the daytime nothing is wrong with the telescope-- most objects in the sky are very tiny-- you must be pointed directly at them to see them. During the day line up the small finder telescope on top with the main telescope-- then use the small finder to point the larger "tube" directly at the object in the sky.