C:\Users\selecaotwo\temp\rez_release_test\package_b>rez-release -v -m "another test"

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Releasing package_b-0.2.0...
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Checking state of repository...
Password for 'https://korinkite@bitbucket.org':
Resolving build environment: 'package_a==|0.1+'
resolved by selecaotwo@DESKTOP-E3D313L, on Mon Jan 14 13:30:50 2019, using Rez v2.26.1

requested packages:
package_a==|0.1+
~platform==windows       (implicit)
~arch==AMD64             (implicit)
~os==windows-10.0.17134  (implicit)

resolved packages:
package_a-0.1.0  C:\Users\selecaotwo\.rez\packages\int\package_a\0.1.0

Invoking custom build system...
Running build command: python C:\Users\selecaotwo\temp\rez_release_test\package_b/rezbuild.py install
'0.1+' is not recognized as an internal or external command,
operable program or batch file.
13:30:50 ERROR    BuildError: The custom build system failed.