What do I need do to solve this error?

Severe  ** * ComputeIntSolarAbsorpFactors: Solar distribution model is set to place solar gains on the zone floor,
   **   ~~~   ** *   ~~~   * but Zone ="THZ_1" floor cannot absorb any solar gains. 
   **   ~~~   ** *   ~~~   * Check the solar absorptance of the inside layer of the floor surface construction/material.
   **   ~~~   ** *   ~~~   * Solar gains will be spread evenly on all surfaces in the zone, and the simulation continues...
   ** * Severe  ** * ComputeIntSolarAbsorpFactors: Solar distribution model is set to place solar gains on the zone floor,
   **   ~~~   ** *   ~~~   * but Zone ="THZ_3" floor cannot absorb any solar gains. 
   **   ~~~   ** *   ~~~   * Check the solar absorptance of the inside layer of the floor surface construction/material.
   ** *   ~~~   ** Solar gains will be spread evenly on all surfaces in the zone, and the simulation continues...

Severe * ComputeIntSolarAbsorpFactors: Solar distribution model is set to place solar gains on the zone floor, * ~~~ * but Zone ="THZ_1" floor cannot absorb any solar gains. * ~~~ * Check the solar absorptance of the inside layer of the floor surface construction/material. * ~~~ * Solar gains will be spread evenly on all surfaces in the zone, and the simulation continues... * Severe * ComputeIntSolarAbsorpFactors: Solar distribution model is set to place solar gains on the zone floor, * ~~~ * but Zone ="THZ_3" floor cannot absorb any solar gains. * ~~~ * Check the solar absorptance of the inside layer of the floor surface construction/material. * ~~~ ** Solar gains will be spread evenly on all surfaces in the zone, and the simulation continues...