Hello, I am creating a survey invitation with apex and I am getting this error because I didn't mention a communityId. Need a help?

16:24:03:051 FATAL_ERROR System.DmlException: Insert failed. First exception on row 0; first error: INVALID_FIELD_FOR_INSERT_UPDATE, Select the community that this participant belongs to.: []

This is my code : 

 Id surveyId = [SELECT Id

                       FROM Survey

                       WHERE Name = 'Partner Satisfaction Survey'].Id;

        Id communityId = [SELECT Id FROM Community].Id;

        SurveyInvitation surveyInv = new SurveyInvitation();

        for(Contact c : lContacts){

            if(c.IsSurveyInvitationSent__c == false){

                surveyInv.Name = 'PartnerSatisfactionSurveyInvitation';

                surveyInv.ParticipantId = c.Id;

                surveyInv.CommunityId = communityId; 

                surveyInv.OptionsAllowGuestUserResponse = true;

                //surveyInv.OptionsAllowParticipantAccessTheirResponse = true;

                surveyInv.SurveyId = surveyId;

                c.IsSurveyInvitationSent__c = true;

                recordsProcessed +=1;

            }

        }