System.Windows.Markup.XamlParse Error Code

My application runs fine in the IDE. I publish and then I get the error

System.Windows.Markup.XamlParse

More details below.

How can I resolve this? what should I look into?

Problem signature: Problem Event Name: CLR20r3 Problem Signature 01: projectwizard.exe Problem Signature 02: 1.0.0.0 Problem Signature 03: 551d7afc Problem Signature 04: ProjectWizard Problem Signature 05: 1.0.0.0 Problem Signature 06: 551d7afc Problem Signature 07: 8 Problem Signature 08: 1 Problem Signature 09: System.Windows.Markup.XamlParse OS Version: 6.1.7601.2.1.0.768.3 Locale ID: 1033 Additional Information 1: 0a9e Additional Information 2: 0a9e372d3b4ad19135b953a78882e789 Additional Information 3: 0a9e Additional Information 4: 0a9e372d3b4ad19135b953a78882e789