Work / info. work in Poland with and temporary card residence? [5]

Hello to all.
My name is Maria, I have an Bolivian nationality. I live in poland through three years , mother of two daughters with Polish nationality and I live with the father of my daughters, but we are not married.

Two months ago I am employed as teacher of arts at dom kultura. The persons of my work want to do a contract of long-term work. On having presented my papers ... it turns out that with a karta pobytu czasowe I cannot work, ani z umowa z leczenia ani z umowa prace. Does someone know something on the topic?

Best Regards