Full error message: could not load file or assembly microsoft.visualstudio.tools.applications.core 10.0.0.0
Environment Note: This was a SQL server dev box originally delivered without Data Tools. It seems to be common thread with people reporting this issue that Data Tools was installed after the initial install of SQL 2012.
Things to Try First:
Try the solution in the link in this connect article first. It solves almost everyone's problem (particularly if you are on Sql 2012 on an older OS, or migrating packages from SQL 2008 to SQL 2012 Data Tools).
What Was Different About My Environment:
My environment is Windows 2012/SQL 2012. As of the current date, most of the reports of this issue are on Windows 2008R2/SQL 2012.
If after attempting to reinstall Data Tools and SSIS in the correct same order it still does not work, attempt to install the redists (below) for VSTA and the VisualStudioShell. On 2012, even as an administrator running explorer in administrator mode this may not go well.
The install files should be in
- %SQL 2012 install%\redist\VSTA\runtime\x86
- %SQL 2012 install%\redist\VSTA\runtime\x64
- %SQL 2012 install%\redistVisualStudioShell\VC10SP1\x86
- %SQL 2012 install%\redist\VisualStudioShell\VC10SP1\x64
Right click the .msi file and select install (run all of these, you need both x86 and x64 for development and unit testing). If you get a message that it can't find the file, (even though it's right there and you just clicked it, you need to make some changes).
Assuming this is a dev/sandbox, and you have administrator permissions, you just need to make a couple of changes, and then install the redistributables and you're home free!
I also set the user account type to administrator in user accounts, but I'm not confident that had much to do with it.
If you're not an admin:
I'm reasonably confident the permissions are required for the installation, and not the launch of the script component, so if you're not an admin of the machine (I haven't tested that), it would be worth asking the admin to go through the steps. The rest of SQL 2012 installs fine on windows 2012 even if installed after the initial install.