Unknown user with identity contact admin

[#1]

I have been getting erros when I try to access the UI. I have create my certificated and import in the chrome browser. 

Unknown user with identity 'CN=Sefahnifi, OU=SEFAHDEMO'. Contact the system administrator.

<authorizers>

<userGroupProvider>

<identifier>file-user-group-provider</identifier>

<class>org.apache.nifi.authorization.FileUserGroupProvider</class>

<property name="Users File">./conf/users.xml</property>

<property name="Legacy Authorized Users File"></property>

<property name="Initial User Identity 1">CN=Sefahnifi,OU=SEFAHDEMO</property>

</userGroupProvider>

<accessPolicyProvider>

<identifier>file-access-policy-provider</identifier>

<class>org.apache.nifi.authorization.FileAccessPolicyProvider</class>

<property name="User Group Provider">file-user-group-provider</property>

<property name="Authorizations File">./conf/authorizations.xml</property>

<property name="Initial Admin Identity">CN=Sefahnifi,OU=SEFAHDEMO</property>

<property name="Legacy Authorized Users File"></property>

<property name="Node Identity 1"></property>

<property name="Node Group"></property>

</accessPolicyProvider>

<authorizer>

<identifier>managed-authorizer</identifier>

<class>org.apache.nifi.authorization.StandardManagedAuthorizer</class>

<property name="Access Policy Provider">file-access-policy-provider</property>

</authorizer>

</authorizers>