how to deal with the the problem of "badly shaped, not convex, warped,or not mumbered counter-clockwise"?

hello everyone,

anybody can help me to work out the issue, which showing the following warning after running analysis.

 *WARNING* PLATE NO.     4(JOINTS     51 -     53 -     52 -     50)         

IS BADLY SHAPED, WARPED, NOT CONVEX, OR NOT NUMBERED COUNTER-CLOCKWISE.

thanks in advance.

regards,

kazeem.