I uninstalled, deleted the whole arudinoPlugin folder, and installed again, that fixed it. But now i have another problem i cant select anything in "Platforms and Boards" I click on checkboxes but ...

Sloeber, the Arduino IDE for Eclipse The Eclipse IDE (Integrated Developement Environment) is a full featured programming editor with many fantastic features to help you code more quickly and easily.

There are a lot of solutions to programing an Arduino: the default avr-g++, Studio, etc. But [Sandeep] let us know about using one of the more powerful IDEs out there, Eclipse, to do the same.