The links that James R. provided in the above response should help you fix this washer problem. I recommend that you review the information in that previous answer and view the video that he provided.
If those tips don't help, then you may have a component problem in the washer that is preventing it from spinning. The control will normally flash an error code when it detects a component problem and stops the washer. I provided technical information regarding the error codes in the images below. This additional information may help you determine the cause of your problem. NOTE: This information is intended for technicians. Follow electrical safety guidelines when using this data.
Unplug the washer
to disconnect electrical power before accessing internal components. Some of the tests describe live voltage checks. I do not recommend that you conduct that type of test yourself. A service technician will normally need to conduct that type of test on the washer. Here is a link for the Sears Service website in case you need it:
Sears Home Services
If you need more help, reply with additional details (including the error code if one is displayed).