Sorry for the delay in response to you on this. It looks like you have since been able to generate your Android build successfully.
For Android, you can no longer do builds for 4.4 as we only produce 5.0 apps now. However, even though you are exporting a 4.4 MIB, this is not the reason your builds were failing.
It's hard to know at this point what was causing the build failure but let me know if you have any further questions.
Mag+ Support Team