# Why is my required bundle with version x.y.z. not resolved?

To specify a version in a Require-Bundle header an (OSGi standard) attribute bundle-version is needed.

<code> Require-Bundle: bar;bundle-version=" x.y.z,x.y.z" </code>

The attribute is spelled bundle-version= rather than version= as used with Import-Package. A misspelled attribute can show the following error:

<code>

       Resolver report:
           A Require-Bundle could not be resolved. Caused by missing constraint in bundle <foo_1.0.0>
                constraint: <Require-Bundle: bar; bundle-version="0.0.0">

</code>

If a required bundle cannot be resolved check the spelling of the attribute as well as the location of the required bundle.