Crash report. Initially reported by @Glease. Can be reproduced with given mod list (found in crash report).

The issue is most likely due to Forestry removed their method regarding Redstone Flux compatibility as there is no API packages provide cofhapi|energy; whereas, in this case, Railcraft is the only mod shipping with RedstoneFlux API in this modpack, but is still using the old modid (i.e. provides = "CoFHAPI|energy" in @API annotation). As such, Forestry thinks RF is present but still removes their methods for compatibility.
Therefore, I believe it should be reported on Railcraft's side, rather than Forestry.

We will indeed remove that api in 10.2, the very next version released. So there is no need to keep that API-we once kept it as a submodule but it simply does not update on time.

And by that time, the machines will no longer use rf. They will switch to Railcraft charge or some similar power source.

But this doesn't sound like a "rejection" - but, another approach of fixing problem, I will say.

"rejected" means we reject to update the RF api.

I guess the only possible workaround is adding CoFHLib?

Regarding #1203: while it is planned to get rid of Redstone Flux, before that happens, this issue is still a real bug for those who don't install CoFHLib (or CoFHCore? can't remember exactly) for whatever reason. Please consider about it.

Just disable the Powered Rolling Machine and use the Manual one for now.

The bigger question....does this affect the @API id for our API. Or do we worry about that for 1.11?

Since powered rolling machine uses charges now, question: will there be means to get charge in next released version?

@3TUSK Read this: 7321d70#diff-cde1bad81f8d19c277f72a919cdec65fR46

... TileChargeFeeder is abstract. I mean the actual method(s) (in terms of actual gameplay) to get Railcraft charge.

Yes, you should read that commit.

... I saw nothing but #1203 ? Either way I will wait for next release.

Don't worry, more things will come up as of the release.

The next release will for sure include craftable, pre-charged single use charge batteries.

Beyond that, the Steam Turbine is still a way off, but there have been some discussion of a lower tech solution, though admittedly not much has come of the conversation so far. I'm open to suggestions.