Error while building spdx document reference for path

[Coehill]

When running the following command:
go run sbom_compose.go -d ....\SPDX_format_SBOMs\

with files named:
sbom_2023-01-01_123456.spdx.json
sbom_2023-01-01_123457.spdx.json

I get this error:
_
| | ___ _ __ ___ ___ ___ _ __ ___ _ __ ___ ___ ___ _ __
/ | ' \ / _ | ' ' \ _____ / / _ | ' ' _ | ' \ / _ / |/ _ \ '|
__ \ |) | () | | | | | || (| () | | | | | | |) | () __ \ / |
|/_./ _/|| || || __/|| || || ./ _/|/_||
|_|

←[0m...generating composed SPDX document from directory: ....\SPDX_format_SBOMs
...using config: config.yaml
error while building spdx document reference for path ....\SPDX_format_SBOMs\ with config top-level-artifact, &{https:/
/spdx.org/spdxdocs/ Tool sbom-composer-1.0 [] map[]}: open ....\SPDX_format_SBOMs.pdx.json: The system cannot find the
file specified.
panic: runtime error: invalid memory address or nil pointer dereference
[signal 0xc0000005 code=0x0 addr=0x88 pc=0x5a7fa8]

goroutine 1 [running]:
github.com/opensbom-generator/sbom-composer/parser.UpdatePackages(...)
C:/Users/MyUsername/go/pkg/mod/github.com/vmware-samples/sbom-composer/[email protected]
b0/document.go:35
github.com/opensbom-generator/sbom-composer/parser.Build({0x6638f6, 0x3}, {0xc0000aa060, 0x18}, 0xc000102000)
C:/Users/MyUsername/go/pkg/mod/github.com/vmware-samples/sbom-composer/[email protected]
b0/build.go:15 +0xa8
github.com/opensbom-generator/sbom-composer/parser.GenerateComposedDoc({0xc0000aa060, 0x18}, {0x665e4d, 0xd}, {0x66385c,
0x2}, {0x0, 0x0, 0x0}, {0x6654b6, ...})
C:/Users/MyUsername/go/pkg/mod/github.com/vmware-samples/sbom-composer/[email protected]
b0/build.go:36 +0xae
.....
github.com/spf13/cobra.(*Command).execute(0x8040e0, {0xc0000d2010, 0x2, 0x3})
C:/Users/MyUsername/go/pkg/mod/github.com/spf13/[email protected]/command.go:872 +0x694
github.com/spf13/cobra.(*Command).ExecuteC(0x8040e0)
C:/Users/MyUsername/go/pkg/mod/github.com/spf13/[email protected]/command.go:990 +0x3bd
github.com/spf13/cobra.(*Command).Execute(...)