My build has two solutions, 1. CESA.sln ( it has 5 projects) 2. CSA.Sln ( it has 5 projects) For development time, I need to compile CESA.sln and get dll's and moved to one common folder. Then, I compile CSA.Sln (web application with 5 projects) and this web application needs to deployed on IIS. This is the same approch needs to follow on TFS build also.I have created the build file pasted below. But what happen,It is not throwing any compilation error and drop are properly landed at mentioned location. When I deployed the drop at IIS (at integration machine), it was throwing following error message. But When I copied the same build from my development environment and deployed at integration machine. it is working fine and not throwing this error.(One more thing , I have noticed, it is not copied the ascx file in to drop.(this is different error). Please let me know how to resolve this error.

ERROR START Object reference not set to an instance of an object. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object. Source Error: Line 57: Line 58: Line 59: <%=getWarningInfo() %> Line 60: Line 61: Source File: d:\cesaapps\CSA\CSAWeb\MainParent.Master Line: 59 Proj FILE Starts here ----------------- THIS BUILD WILL BE PERFORMED AT INTEGRATION BRANCH CODE BASE. ATC5BSSBLD01 PSAS C:\INTEGRATION_BUILD_COMPILE \\ATC5BSSBLD01\INTEGRATION_BUILD false Symptom=build break;Steps To Reproduce=Start the build using Team Build Never true Build failure in build: This work item was created by Team Build on a build failure. The build log file is at: The errors/warnings log file is at: false true false false false Release Any CPU