My Claymore Ethereum miner on Nanopool was showing this '' Pool sent wrong data, cannot set epoch, disconnect '' error and there is nothing to worry about it. The problem is older versions of the miner can mine only up to block 6000000 (DAG epoch 200) and currently DAG epoch 202 is running. So, just update your Claymore miner to the Latest version which is v11.9 now and the problem will be solved.
For Download Links and other details, read their official bitcointalk thread
Happy mining :)
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