Communication to SolarEdge equipment from Charge HQ is currently broken for a small number of users. We are working with SolarEdge to resolve the issue.
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Note: disconnecting and reconnecting from Charge HQ will not help: reconnection will fail. We suggest to leave your connection in place, and the error will go away when the issue is resolved.

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If you wish, you may like to raise a support case with SolarEdge. As this issue only impacts a small number of users, they may assign it higher priority if more users contact them about it. Support cases can be raised here: https://www.solaredge.com/en/support