win11 -: package ; expected main packages contain errors!

[feng99]

os: win11

go version go1.17.11 windows/amd64

directory structure:

dot -version
dot - graphviz version 7.0.5 (20221223.1930)
libdir = "D:\Program Files\Graphviz\bin"

command:
go-callvis main.go
or
go-callvis -focus=main ./
or
go-callvis -focus=main

result:
D:\code\go\fiber_demo\main.go:19:306: illegal UTF-8 encoding
-: package ; expected main
2023/03/14 11:42:29 packages contain errors

seek help. thanks

[ondrajz]

Does the project compile OK without go-callvis?