I'm getting error NHibernate.MappingException could it be a many-to-many relationship error

Question

In .Net Core, I need to establish many-to-many relations and one-to-many relations with NHibernate xml mapping, but when I establish these relations, I get an error. When I searched, I could not find many sources. I have no idea where the problem originates from. I would appreciate if you could help me about this issue.

full explanation of the error I got: XmlSchemaValidationException: The element 'list' in namespace 'urn:nhibernate-mapping-2.2' cannot contain text. List of possible elements expected: 'meta, subselect, cache, synchronize, comment, key' in namespace 'urn:nhibernate-mapping-2.2'.

public class API_KEY: IEntities
    {
        public virtual int API_KEY_ID { get; set; }
        public virtual string KEY { get; set; }
        public virtual int USER_ID { get; set; }
        public virtual int COMPANY_ID { get; set; }
        public virtual string APP_URL { get; set; }
        public virtual int STATUS { get; set; }

        //Relational Properties

        public virtual COMPANY COMPANY { get; set; }
        public virtual API_KEYS_USER API_KEYS_USER { get; set; }
        public virtual List<ROLE_API_KEY> ROLE_API_KEY { get; set; }
        public virtual API_KEY_LOG API_KEY_LOG { get; set; }

    }



<class name="API_KEY" table="API_KEY">



        <id name="API_KEY_ID" column="API_KEY_ID">

            <generator class="sequence">
                <param name="sequence">SEQ_API_KEY_ID</param>
            </generator>

        </id>

        
        <property name="KEY"/>
        <property name="USER_ID" column="USER_ID"/>
        <property name="COMPANY_ID" column="COMPANY_ID" />
        <property name="APP_URL" />
        <property name="STATUS" />

        <list name="ROLE" table="ROLE_API_KEY" lazy="false">
                        <key column="ROLE_ID"/>
                        <many-to-many column="ROLE_ID" class="ROLE" />      
        </list>
        
        <many-to-one name="API_KEYS_USER" class="API_KEYS_USER"
            column="API_KEYS_USER_ID" not-null="true"/>
        
        <many-to-one name="COMPANY" class="COMPANY"
            column="COMPANY_ID" not-null="true"/>

    </class>


</hibernate-mapping>