App-V: Unable To Import SFT, ERROR Code - 0000C81E

Since most of the old bugs are patched the most common cause I've seen for this is having a special character in the package name. For instance:

Notepad++ 4

C++ 2008 x86 SP1

etc. etc.

It is important to note that the sequencer will not save you from yourself. If it isn't a letter, number or period (.), don't use it. It will save you a lot of trouble in the long run.