Earlier today, I tried to run an SSIS (SQL Server Integration Services that is) package on the development server for the first time (until now, I only tested it on my own machine). When I executed the package with

DTExec /f mypackage.dtsx

I got the following error

Description: Error loading a task. The contact information for the task is "". This happens when loading a task fails.

That sure helped me to located the problem… NOT!