Your error message could mean that the disc was not recognized by InCD. Do you get the InCD mounted message after inserting an InCD formatted disc in your burner?
First, I guess you have only tried a single disc so far. Your problems might be due to bad media, so you should test several discs of different brands (e.g., many users report difficulties with Memorex CD-RW media).
Second, you may have conflicts between InCD and drivers installed by other burning programs or plugins. It may take a while to detect and resolve such issues.
Third, you should upgrade to the latest versions of Nero 126.96.36.199a and InCD 3.52.20b from Ahead's site www.ahead.de
(don't forget Nero Language pack for help files). This needn't resolve your current problems, but it might help in further tests.
Take a look at the InCD troubleshooting guide http://www.cdrlabs.com/phpBB/viewtopic.php?t=9997
and come back with more information. This guide is quite technical in some places. If you don't understand something in the guide, don't worry; just ask.