I have an error , please help

info: number of up-spin electrons is equal to the 
       number of down-spins and spin_polarized=true 
     - consider setting spin_polarized=false . 
Error in File Parameters: CAN Not have fractional Number of Electrons and FIX_OCCUPANCY = TRUE 
file application Called MPI_Abort (of MPI_COMM_WORLD,. 1) - Process 0