Brake Issue/help

I pulled my front driver side caliper to check pads and then compressed the piston with a c clamp and reassembled. I did all this with the reservoir cap off.

I put cap on and went to push my brake pedal and it went right to the floor. Also, when I torqued down the caliper bokts it locks up my rotor and I can't spin it.

What could be causing this? Did I mess something up when I c clamped the piston in?

Thanks
 
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