Got empty VERSION for vEOS-lab-4.23.0.1F.vmdk

[packerliu]

Trying this version, but the VERSION is empty.
If I hard code as VERSION=4.23.0.1F, it works fine.
See below:

$ make
Makefile:18: warning: overriding commands for target docker-pre-build' ../makefile.include:18: warning: ignoring old commands for target docker-pre-build'
for IMAGE in vEOS-lab-4.23.0.1F.vmdk; do
echo "Making $IMAGE";
/Applications/Xcode.app/Contents/Developer/usr/bin/make IMAGE=$IMAGE docker-build;
done
Making vEOS-lab-4.23.0.1F.vmdk
Makefile:18: warning: overriding commands for target docker-pre-build' ../makefile.include:18: warning: ignoring old commands for target docker-pre-build'
rm -f docker/.qcow2 docker/.tgz docker/.vmdk docker/*.iso
cp *.iso docker/
ERROR: Incorrect version string (vEOS-lab-4.23.0.1F.vmdk). The regexp for extracting version information is likely incorrect, check the regexp in the Makefile or open an issue at https://github.com/plajjan/vrnetlab/issues/new including the image file name you are using.
make[1]: *** [docker-build-common] Error 1
make: *** [docker-image] Error 2
$