Looks like the problem exists with your rule definition. If the fuzzy block is part of a bigger simulink diagram, please check the input connections to the fuzzy block or just simulate the fuzzy block as a standalone system with static inputs and if it works then put it back in the simulink file. For the second question, try reducing the number of rules and see if it helps.
You have passed one input to the FIS block where the inference engine needs two. You need to edit the design if you require one input, or edit the simulation if you should have two.