Board arduino_101 (platform arc32, package Intel) is unknown

an not find anything on this error. Does anyone know how to fix this. My other boards work fine. The new Arduino 101 no joy???? Tried old versions back to 1.6.7 to present and still same issue. Why in the world would Arduino have an issue as such and continue to sell this board if this is a problem.

the problem you are experiencing is probably due to another version of the core being installed along with the actual version.
Please navigate through your Arduino15 folder (which is C:\Users$Username\AppData\Arduino15 on win, /Users/$youruser/Library/Ardunio15 on mac and ~/.arduino15 on linux) then into packages/Intel/hardware/arc32 you should find two folder. Remove the oldest one and your sketch should compile correctly