Hi,
Check the OSS Notes 586578 and 992460.
Also check the thread: https://scn.sap.com/thread/3354789
Now, looking at the error message, you have packed multiple materials to the HU, out of which some are stored in HU managed SLoc and some are from non HU Managed SLoc. Is that so? This will also cause the issue. You should pack an HU from consistent locations - either completely from HU managed Loc or completely from Non HUM.
Thanks
Prem