ERROR failed to read supergraph schema reason=stream did not contain valid UTF-8

Bump into the error while trying to run apollo router.  

Anonymous usage data is gathered to inform Apollo product development. See https://go.apollo.dev/o/privacy for details. 2026-07-16T09:46:43.188554Z ERROR failed to read supergraph schema reason=stream did not contain valid UTF-8 2026-07-16T09:46:43.234786Z INFO state machine transitioned event="NoMoreSchema" state=Errored previous_state="Startup" 2026-07-16T09:46:43.235259Z INFO stopped 2026-07-16T09:46:43.235740Z ERROR no valid schema was supplied no valid schema was supplied

To resolve this error 

 rover supergraph compose --config ./supergraph.yaml | Out-File -Encoding utf8 supergraph.graphql

and then re--run router 

c:\tools\router --config router.yaml --supergraph supergraph.graphql  

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