You need to make sure the licx file is included in the build.
Our license checks has been modified in the 2.0 versions. You need to include the .licx file for the project while building. Please refer these KB''s for more information:
http://www.syncfusion.com/support/kb.aspx?cNode=1063
The important KB is the Licensing:
http://www.syncfusion.com/Support/article.aspx?id=10469
http://www.syncfusion.com/Support/article.aspx?id=10464
The .licx file should have entry for the Syncfusion.grid assembly. If you drop any Grid control to the form and delete it, it should update the .licx file with Syncfusion.Grid details.