theres a little bit of dancing around the bush here. meaning, there is no straight examples given.
1- i open sonar and i receive a message "plug ins are missing"
2- i have plug ins installed to said directory.
3- i have told plug in manager to look in this directory for my plug ins.
see what i mean ? a little more info would not only help us understand exactly what you are talking about, but might even help you solve your problem. what plug ins and where are they ?