I just installed Rocket for Moodle 2.3. (Earlier versions of the theme were not already installed.) Debug mode set to Developer level. When I display a course page (with edit mode on or off) I see the list of error message below at the top of the page.

Notice: Undefined variable: PAGE in C:\MoodleServer\docs\moodle\theme\rocket\renderers.php on line 185

Notice: Trying to get property of non-object in C:\MoodleServer\docs\moodle\theme\rocket\renderers.php on line 185

Notice: Trying to get property of non-object in C:\MoodleServer\docs\moodle\theme\rocket\renderers.php on line 185

Notice: Trying to get property of non-object in C:\MoodleServer\docs\moodle\theme\rocket\renderers.php on line 185

Notice: Undefined variable: formclose in C:\MoodleServer\docs\moodle\theme\rocket\renderers.php on line 187

Notice: Undefined variable: formopen in C:\MoodleServer\docs\moodle\theme\rocket\renderers.php on line 193