SPF invalid value

Hello, I need help with an error message that appeared in Exim configuration (Home "Service Configuration "Exim Configuration Manager "Mail). I opened this config screen looking for something else but I got a red notification on 'SPF include hosts for all domains on this system' that states '[COLOR=rgb(184, 49, 47)]The current value for this field is invalid. You must update it.' but the value is 'None', the default value! -config-WHM-error.png">72189 The value for SPF txt records on new accounts is: v=spf1 +a +mx +ip4:x.x.x.x ~all
and I think it is correct (I don't really know why it specifies the IP address even though it is already A and MX records) What's wrong with my Exim configuration? or why does it generate this error message? Thank you in advance. Mauricio