I am trying to insert joints to my character in Maya 2013 but joint tool is not working. I select skeleton/joint tool but when i click on my character to insert joints, i see no response. I checked on the Internet for a solution, i tried deleting the preferences folder but no success. I can insert and connect joints in empty space but not into my character. One more thing to note is that i tried to import my Maya file to Maya 2015 but still i cannot insert joints to my character.