There are many ways to fix this, like enabling automatic signing etc. But if you want to understand the reason for this error you need to look at the error message.
It says that the provisioning profile you have selected in the "General tab", does not contain the signing certificate you selected in the "Build settings" -> "Code Signing Identity".
Usually this happens if a distribution certificate has been selected for the debug identity under "Build settings" -> "Code Signing Identity".
If this happens under "Signing (Debug)" it might also be that the "Signing Identity" -> "iOS Development" is not included in the provisioning profile.
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