How to resolve Mirror And Pattern command error in solidworks for beginners

this body is basically designed for beginners who dont know why they are facing error during mirror command or pattern command in solidworks how to solve : only merging features may be patterned . If appropriate make a pattern bodies instead how to solve mirror and pattern command error in solidworks . how to solve error in mirror command in solidworks. how to to solve error in pattern command in solidworks.problem in mirror command in solidworks. problem in pattern command in solidworks. problem in instance mirror command in solidworks