I have installed the command line of the work items, and the following code gives me an error in the methods "getWorkItemCommon" and "getMonitor".

private String calculateCategoryAsString(Object value)
            throws TeamRepositoryException {
        if (value != null) {
            if (value instanceof ICategoryHandle) {
                return getWorkItemCommon().resolveHierarchicalName(
                    (ICategoryHandle) value, getMonitor());
            }
            throw new WorkItemCommandLineException(
                    "Convert Category - Incompatible Type Exception: "
                            + value.toString());
        }
        return CONSTANT_NO_VALUE;
    }