I did a test by Installing Universal Email Version 3.0.7 which is the latest version. And the line number that is being reported with the error does not match the line number i have. So it could be that some files did not get overwritten when you installed the extension.
If you prefer not to rename you configuration folder, please try these steps:
1. remove Universal Email from the extension manager
2. browse to this location:
C:\Users\<Your username>\AppData\Roaming\Adobe\Dreamweaver CS4\en_US\Configuration\Shared\WebAssist
and delete the UniversalEmail folder
3. install Universal Email 3.0.7 again, delete the cache file and start DW again.