I have a similar problem but without the error message, SW is useless. Within the 24 hour restriction, using either the SW app (most current version) or going to the SW web site on my iphone (current ios), I cannot check-in but get a error message which says ths reservation is not eligible for check-in. But if I go to the hotel's pc and goto the SW web site I can check-in with no problem. But by then I have a poor boarding position.
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