For anyone seeing this.  It's due to the high number of transactions inputs within your wallet.  I followed the following the following video and was able to import the private keys into Electrum cash (make sure you are not doing this with standard electrum) from multibit classic.  Even then I was not able to move the whole amount at once due to the number of inputs.  I then sent the transactions in parts.  Since I was not sweeping all at once and was sending part of the funds in chunks I was able to move the funds successfully.

https://www.youtube.com/watch?v=LaijbTcxsv8

Anyone has any ideas?  Been working on this for days.   

Tip for Mycelium users or anyone that needs to use the Bip39 standalone tool

- Mycelium
1) Download and execute this: https://github.com/iancoleman/bip39/blob/master/bip39-standalone.html (Right click and Save as...)
2) On "BIP39 Mnemonic" space you have to insert the seed of your wallet, the 12 words.
3) You will get the list of your addresses and their private keys.
4) By going with the cursor on a private key, the page will show the qrcode. Sweep it with Coinomi


Within the mycelium app and many other wallets there is a way to see your unspent outputs.
Within mycelium this is under the accounts > ... >show unspent outputs.

When you bring up the derived addresses in the bip39 page.  Get it to show many addresses (I did 500).  Then search the page for the public keys from the unspent output list and only sweep the private keys related to that.  That way you don't have to sweep every key to find out if there is a balance.

This saves considerable amount of time.  For some reason I had few that didn't show up even with 500 keys.  Not sure why.

Great information. Very helpful.

I am hoping you can help some more  

I am trying to import from Multibit classic.  I have exported the private key but when I try to sweep it in Coinomi I get the following error.  What are my options?

"The transaction is bigger than what the network allows, try sending a different amount"
I suspect this is due to this wallet having lots of transacitons (was used for mining).  My other multibit classic wallets imported fine.

Thanks,
NJ