First, I initialized gqlgen.
go run github.com/99designs/gqlgen init
Second, I fixed resolver.go and schema.resolvers.go And, I execute this. Then error has occurred.
$ go run github.com/99designs/gqlgen generate
reloading module info
modelgen: unable to find type: github.com/99designs/gqlgen/interfaces.Int
exit status 1
Do you know what is problem?
I did not expect what is problem.