It does not seem to be dependent on checking or unchecking any boxes, as of yesterday it was still occurring. I usually do ask *not* to receive early results, I usually do *not* ask to resend to non-openers. I just sent a campaign this afternoon, *did* ask to resend to non-openers, and did not receive any errors.
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I have been receiving this error the past 3-4 times I have tried to schedule a campaign. Usually I can get it working eventually, but it is frustrating to see and have to retry so many times.
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