Capacitive Sensing Library being ignored by arduino UNO.

Projects Programming
18

As Starter92, I have the following message :

CapacitiveSensor does not name a type
CapacitiveSensorSketch:12: error: 'CapacitiveSensor' does not name a type
CapacitiveSensorSketch.pde: In function 'void loop()':
CapacitiveSensorSketch:22: error: 'cs_4_2' was not declared in this scope

That's my issue and there is no solution if I well understand.

Thanks a lot