Problem with watches on esp32

I tried to use a watch on a esp32 where I got the following error:

setWatch(function(st) { console.log(st.time) }, D4, {repeat: false, edge: 'falling', debounce: 10});
WARNING: Unable to set watch. You may already have a watch on a pin with the same number (eg. A0 and B0),
or this pin cannot be used with watch

I also tried other pins which should work without luck. I am using esruino 2v00 on a esp32s chip. On espruino 2v01 i get the same message.