[MacPorts] #57633: I tried to upgrade macports. but this error showed up

[MacPorts]

#57633: I tried to upgrade macports. but this error showed up
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 Reporter:  vvn29                           |      Owner:  (none)
     Type:  defect                          |     Status:  new
 Priority:  High                            |  Milestone:
Component:  ports                           |    Version:  2.5.4
 Keywords:  can't read "configure.sdkroot"  |       Port:
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 I tried to upgrade macports. but this error showed up

 VIVIANs-MacBook-Pro:~ vivianwilfred$ sudo port upgrade outdated
 Password:
 Error: Unable to determine location of a macOS SDK.
 Error: Unable to open port: can't read "configure.sdkroot": Unable to
 determine location of a macOS SDK.


 What should i do to correct this?

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Ticket URL: <https://trac.macports.org/ticket/57633>
MacPorts <https://www.macports.org/>
Ports system for macOS