둘 이상의 IStreamUpgradeProviderElement를 BindingContext의 BindingParameters에서 찾았습니다. 이것은 일반적으로 CustomBinding에 여러 IStreamUpgradeProviderElements가 있기 때문에 발생합니다. 이러한 요소를 하나만 제외하고 모두 제거하십시오.

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More than one IStreamUpgradeProviderElement was found in the BindingParameters of the BindingContext. This usually is caused by having multiple IStreamUpgradeProviderElements in a CustomBinding. Remove all but one of these elements.

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