This is a template error. It can be very difficult to pinpoint the problem. You'll have to be certain on which page you see this error message. Then find it's .tpl file. For example, if you're getting the error message on the viewtopic.php page, its .tpl file would be viewtopic_body.tpl.
Then you'll need to look for switches, which look like this...
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<BEGIN> and <END>
The xxxxxx represents the name of the switch. In most cases the reason you'll get the error message is because the BEGIN or END switch tags are case sensitive and must be upper case. Other times either one of the tags can be completely missing.
This can be a tough fix, but if you find which file is giving you the trouble, you can post it and I can take a look.