One of the features that people will want to explore first in TM1 10 is the ability to include tm1web sheets within a contributor application.
It may not be obvious but you cannot open these applications within Cognos Insight.
By default your application is set to use the client, tm1web, Cognos Insight - Connected and Cognos Insight - Distributed.
If you try to deploy your application with a websheet and have NOT changed these default client settings then your deploy will fail.
You have to select that application in modeller and on the properties you will need to deselect Cognos Insight - Connected and Cognos Insight - Distributed.