vauxhall vectra 1.8 petrol 2002 no power but high revs when accelerating?

vauxhall vectra 1.8 petrol 2002 no power but high revs when accelerating
In 1st and 2nd gear when i press the accelerator the revs go up but the car barley moves. If I press the pedal more slowly the car does pick up speed.
Someone told me this could be a clutch problem could they be right or could it be something else?