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SQL Reporting Services in Visual Studio 2012

Hi,
I have been using the Business Intelligence templates in VS2012 to create a report project, based on SQL Server 2008R2.  This was working fine, but now will not allow the project to build at all (it has been checked into TFS for some time, as has not changed at all since the last time it worked).  The error is "Error: Value cannot be null".  Which is obviously spectacularly unhelpful.  I tried removing the reports one by one, but it still happened when all had gone.  I then created a new report project, created a new report, with a textbox (no data sources or datasets set up).  Same error.  It is obviously not related to the project itsefl therefore.

The only thing I can think of that's changed is I recently installed Xamarin Indie edition, which has a lot of integration with VS2012.  I tried removing all but one of the extensions relating to this (I can't tell which the final one is in the add/remove programs, and I don't want to break the Xamarin product itself).

Could this install have broken VS2012?  Or has there been a Microsoft update that might have done it?  If anyone has any ideas, or has seen something similar, all suggestions are welcome!

Full output of build (new project, with no actual content at all):

------ Build started: Project: TestReporting, Configuration: Debug ------
Error: Value cannot be null.
========== Build: 0 succeeded or up-to-date, 1 failed, 0 skipped ==========

Thanks
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itfocus
Asked:
itfocus
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ValentinoVBI ConsultantCommented:
So the error occurs when you build the project, all other functionality is working as expected?  Just wondering, why would you Build a Reporting Services project? (there's no code that needs to get turned into a binary)
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itfocusAuthor Commented:
It happens when you build prior to a deployment.  There is no getting around the build process - it does it automatically when you choose to deploy.

All other functionality seems to be ok - you can create reports, add datasources and data sets, save them.... just when you come to build/deploy, this error comes up.

Thanks
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itfocusAuthor Commented:
Previews actually don't work either; says "The report preview failed because the report could not be built. Read the errors, warnings, and messages in the Error List window for specific build failures".

All the error window says is "Error: Value cannot be null"
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itfocusAuthor Commented:
I have just spent some more time playing with this, and I discovered another Visual Studio add-on I didn't realise was there - an evaluation version of Spices.  I uninstalled this, as I don't need it.  Opened the report project again, and it is now working.

Could be a coincidence (unlikely, but I suppose possible), but thought I'd put it here just in case it ever helps anyone else.
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ValentinoVBI ConsultantCommented:
"It happens when you build prior to a deployment.  There is no getting around the build process - it does it automatically when you choose to deploy."

Ow right, true enough!

Glad to hear you got it resolved :)
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itfocusAuthor Commented:
Resolved issue
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