I had the same error - for some reason new ethers.providers.JsonRpcProvider() wasn't recognizing the network running so I had to pass the url explicitly i.e
new ethers.providers.JsonRpcProvider("127.0.0.1:8545");
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I had the same error - for some reason new ethers.providers.JsonRpcProvider() wasn't recognizing the network running so I had to pass the url explicitly i.e
new ethers.providers.JsonRpcProvider("127.0.0.1:8545");