pegomock: pegomock generate panics with `cannot find module for path`

I’m following the docs to the best of my ability, but can’t seem to get around this issue (note I scrubbed the module and user names from the path):

~/go/bin$ wget --quiet -O pegomock_2.2.0 https://github.com/petergtz/pegomock/releases/download/v2.2.0/pegomock_2.2.0_linux_x86_64
~/go/bin$ chmod a+x pegomock_2.2.0 

~/go/bin$ cd ~/VisualStudioCode/go/<module>/core/
~/VisualStudioCode/go/<module>/core$ go get github.com/petergtz/pegomock@v2.2.0
go: finding github.com/petergtz/pegomock v2.2.0
go: finding github.com/onsi/gomega/format latest
~/VisualStudioCode/go/<module>/core$ grep -n2 "UUIDGen interface" core.go 
28-
29-// UUIDGen is an interface for a type that generates random UUIDs.
30:type UUIDGen interface {
31-	GetUUID() uuid.UUID
32-}
~/VisualStudioCode/go/<module>/core$ pegomock_2.2.0 generate UUIDGen
panic: Loading input failed: exit status 1 caused by:
build command-line-arguments: cannot find module for path _/home/<user>/VisualStudioCode/go/<module>/VisualStudioCode/go/<module>/core


goroutine 1 [running]:
github.com/petergtz/pegomock/pegomock/filehandling.GenerateMockSourceCode(0xc000094c80, 0x2, 0x2, 0x0, 0x0, 0xc000080642, 0x9, 0x0, 0x0, 0x0, ...)
	/Users/pego/workspace/go/src/github.com/petergtz/pegomock/pegomock/filehandling/filehandling.go:110 +0x5ea
github.com/petergtz/pegomock/pegomock/filehandling.GenerateMockFile(0xc000094c80, 0x2, 0x2, 0xc000074240, 0x52, 0x0, 0x0, 0xc000080642, 0x9, 0x0, ...)
	/Users/pego/workspace/go/src/github.com/petergtz/pegomock/pegomock/filehandling/filehandling.go:64 +0xf0
github.com/petergtz/pegomock/pegomock/filehandling.GenerateMockFileInOutputDir(0xc000094c80, 0x2, 0x2, 0xc00001c004, 0x3d, 0x0, 0x0, 0x0, 0x0, 0xc000080642, ...)
	/Users/pego/workspace/go/src/github.com/petergtz/pegomock/pegomock/filehandling/filehandling.go:40 +0x17f
main.Run(0xc000078060, 0x3, 0x3, 0x7e6f80, 0xc00008a000, 0x7e6f60, 0xc000084000, 0xc0000e8690, 0xc0000741e0)
	/Users/pego/workspace/go/src/github.com/petergtz/pegomock/pegomock/main.go:116 +0x226e
main.main()
	/Users/pego/workspace/go/src/github.com/petergtz/pegomock/pegomock/main.go:37 +0xa8

~/VisualStudioCode/go/<module>$ ls go.*
go.mod  go.sum