Today I encountered the following:

[23:12:17] [DynamicEMC Thread/INFO] [Equivalent Exchange 3]: Beginning dynamic value computation
Exception in thread "DynamicEMC Thread" [23:12:17] [DynamicEMC Thread/INFO] [STDERR]:
[java.lang.Throwable$WrappedPrintStream:println:748]: java.lang.IllegalArgumentException: Multiple entries with same key:
1000xfluidStack.oil=[[1xitemStack[item.for.canOil@0]], [1xitemStack[item.bucketOil@0]], [1xitemStack[item.for.waxCapsuleOil@0]],
[1xitemStack[item.for.refractoryOil@0]]] and 1000xfluidStack.oil=[[1xitemStack[item.oilBucket@0]]]

I'm pretty sure EE is upset that there are two kinds of oil: one from BC and one from PneumaticCraft. This stopped DynEMC from being able to run. I searched the issue tracker and it looks like this was brought up before in #486.

I hve EE3 build 507 and am running FML 1448 with the following mods

Can you please provide the full FML log? It's very interesting that it happens as pahimar made a lot of effort to prevent that

Still no match, wish I could say otherwise.

Its at line 43667 (about 1100 lines from the bottom). You'll find it right after the following:

[DynamicEMC Thread/INFO] [Equivalent Exchange 3/]: Beginning dynamic value computation

Closed by mistake. Ignore my idiocy

OK, found it, in RecipeRegistry there is an attempt to copy a MultiMap (which support key duplicates) to a Map (which doesn't).
This seems to be a bug in the google code-base(?). The call stack is suspicious:

com.google.common.collect.RegularImmutableMap.
com.google.common.collect.ImmutableMap$Builder.build
com.google.common.collect.ImmutableListMultimap.copyOf

The transition from a MultiMap to a Map causes the problem, why is that?

I'll fix that with my next pull request. (Please don't close the issue until then)

Thank you!

See the log here: http://bbqsauce.terron.com/bbqsauce.gz (Gzip format)

Interestingly enough, the error has also popped up for the different variations of "fuel" as well.

Next time you send a log use pastebin.
I could not find the lines you were referring to in the log file.

I've forced a DynEMC update and have a full forge log. I cannot upload it to pastebin as it exceeds their limit; It is 8mb. The file is viewable here and it opens as plain text which should be a better alternative than zipping: http://bbqsauce.terron.com/fml.txt

Let me know if I can assist in any other way.

This bug is presented when the assembly is installed Thermal Foundation v1.2.0 or later . Checked by experience , including one fashion.
Sorry for my english , I'm from Russia , and use Google.Translate.

Closing in order to track issues on the unified ticket #990