Welcome rohitpintusurya,
While I only have HFSS 13, it appears that you've assigned the radiation boundary to all sides of your vacuum box - including the bottom face to which you've also applied a PEC boundary. You can't have both applied simultaneously - delete the radiation boundary. Select all faces of the vacuum box except for the bottom face, the apply the radiation boundary. Also, your PerfE_patch PEC boundary should NOT have "infinite ground plane" checked.
Also, for future reference, you do not need to attach the .results folder - it will usually be very large, and is not needed to transfer the design. Just the .hfss file is needed.
Good Luck
PlanarMetameterials