... or something like it.

At the moment every element that implements driving the pipeline (basesrc, all elements that support pull-mode etc.) have their own translated 'Internal Flow Error. Reason: xyz. Please file a bug at http://....' string or something to that effect.

This is bad, for at least three reasons:

 - strings are not consistent

 - strings have to be translated multiple times (possibly even
   multiple times per module, see above)

 - strings are often not very meaningful. We could post a much
   better and more specific error message depending on the flow
   return value.