simu error in hfss13:simu aborted during frequency sweep

can anyone help me?pls.
i have intended to simu a spiral inductor in hfss,but when i've established the structure,i encountor simu error during frequency sweep;
the message is below:
"communication faliure...
communication faliure...
discrete solution,process hf3d exited with code -1073741819
communication faliure..."

the hfss can run some frequency points,but it refused to work at the mid of the fre range.
expecting your reply so much.