无法解析版本约束

Question

I can't add a class( Jalali DateTime Class for PHP ) to my project and have an

ERROR: [UnexpectedValueException]
Could not parse version constraint :dev-master: Invalid version string ":dev-master"

Can anyone help me? Thanks in advance.

Answer 1

You somehow managed to sneak in a colon " : " into the branch name, and this confuses Composer.

Remove the colon, and it should work. However, please take the comment from above into consideration:

1. If the library isn't maintained anymore: Look for alternatives now before you start using it. It is the most convenient time to do.
2. Do not require "dev-master" at all, always require a tagged and released version. This will make your life much easier later on, when you add more dependencies and maybe update them.