If it's gumming up, the dough is too wet and needs to be dried out more by adding flour. The right consistency dough is such that if you tear off a small piece and then tear it in half and squeeze it back together with your fingers it should stick back together but not stay stuck to your fingers. If it stays stuck to your fingers it's too wet and needs more flour. If it is crumbly, it's too dry and needs more water.