Under the CLRA Act, you need to have registration to execture the work through contract labour. In case your registration has expired you can apply for renewal. Unless you have registration there is a bar to employ the contract labourers.
In my opinion, there is no obligation on the part of the contractor to give work to the labourers through out the period of license.
In case you downt have work through out the year, you can opt for temporary registration under Rule 32 of the CLRA Rules. But this registration is given for work which may not exceed 15 days.