Shard a Collection Lab - Wrong Index or Data Import issue?

Could choosing wrong index key cause following error?:

ShardingError004a

And when tried to import using Compass:

ShardingError004

are they related?

Is the total count of documents 516784?

Thanks

Answering my own question here, OK, it was NOT related to the Data Import.

Also as some one suggested I did shut down the mongod processes and restart the VM.

Good luck!