Option "--theme" requires an argument

Getting this?

The execution of task "propel:generate-crud" failed.
- Option "--theme" requires an argument.
- Too many arguments ("propel:generate-crud app module class yourcustomtheme" given).

When running this?

symfony propel:generate-crud backend module class --non-atomic-actions --non-verbose-templates --theme=yourcustomtheme

Try:

symfony propel:generate-crud backend module class --non-atomic-actions --non-verbose-templates "--theme=yourcustomtheme"