Error makepri.exe failed, exit code = -2146958844

This entry in the log file points to the (automatically generated) manifest invalid entry.  There's something about this COM object that we don't handle correctly.  

[10/22/2018 8:06:18 AM] [Error]  e r r o r   C 0 0 C E 1 A 1 :   A p p   m a n i f e s t   v a l i d a t i o n   e r r o r :   T h e   a p p   m a n i f e s t   m u s t   b e   v a l i d   a s   p e r   s c h e m a :   L i n e   1 9 ,   C o l u m n   3 8 6 6 ,   R e a s o n :   ' 0 4 3 f 9 8 0 a - e d a 3 - 4 0 b 2 - 9 2 9 4 - 2 b a c 3 f 1 9 5 b 4 8 '   i s   a   d u p l i c a t e   k e y   f o r   t h e   u n i q u e   I d e n t i t y   C o n s t r a i n t   ' { h t t p : / / s c h e m a s . m i c r o s o f t . c o m / a p p x / m a n i f e s t / f o u n d a t i o n / w i n d o w s 1 0 } C l a s s _ I d ' .

Could you send us the manifest file, which should be here (from your log file):

c:\users\<user>\AppData\Local\Packages\Microsoft.MsixPackagingTool_8wekyb3d8bbwe\LocalState\DiagOutputDir\Logs_1\vojtyqe4.fcc.Manifest

Is there anything unique about the COM object with that GUID in the application you're packaging?