Rrror log clearly indicates you were using Lithium development branch, not Helium.

at org.opendaylight.yangtools.binding.data.codec.impl.IncorrectNestingException.create(IncorrectNestingException.java:28),

is only present in Lithium and Berrylium.

I believe as of now this is fixed.

Rrror Error log clearly indicates you were using Lithium development branch, not Helium.

IncorrectNestingException is only present in Lithium and Berrylium.Berrylium and was not backported to Lithium.

I believe as of now this is fixed.fixed for bgp and pcep.