Is this "we have to be careful"? gracias.
Well, we have, for example:
Cuidar de algo --> To take care of something.
Hemos cuidado de algo --> We have taken care of something.
Lo hemos cuidado --> We have taken care of it.
Nos hemos cuidado --> We have looked after ourselves.
Not entirely sure what "Hemos cuidado" would mean without an object, though. (Perhaps simply "We have taken care".)
"We have taken care of" is what the translator is telling me.