Error code C07 - vaceem backs up and stops

Error code C 07 - clean cliff sensors. I have cleaned them with a soft cloth nomerous times and error will not clear. Any suggestions?

The vacumm just backs up a foot from the base and trips the error code.

crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2889612:0crwdne2889612:0 0

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I also have this problem. I have cleaned the cliff sensors repeatedly but it still backs up and then shuts down with the C07 error code again.

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crwdns2934285:0crwdne2934285:0