Everytime i try to take a picture it says "card

This kind of problem is mostly associated with cards that have been used previously or that have had some sort of formatting before.
The problem you are encountering is this, the card is full with system files that are mostly hidden. Majority of these files are usually log files that keep a record of all the activities the card might have undergone since it began usage.
The only thing you can do to solve this problem is to format the card suing your computer. Formatting the card would help you get rid of previously existing log files and would free up space for new pictures to be stored.
If this doesn't solve your problem, then you may be having a faulty card.
Let me know if you need any assistance with formatting your card.