So recently moved over to Person accounts in lightning and need to make an update to a class and trigger. however when i try to push the changes from sandbox to production i get a bunch of errors in regards to already established @istest and other classes in my production org and wondering if anyone can help. These are the errors im getting and the assocaited classes or test:

Run Failures:
  GuestAccountPopulateTest.PositiveTest System.DmlException: Insert failed. First exception on row 0; first error: CANNOT_EXECUTE_FLOW_TRIGGER, We can't save this record because the “New Guest” process failed. Give your Salesforce admin these details. Probably Limit Exceeded or 0 recipients
: []
  Test_ContactWineClub.myUnitTest System.DmlException: Insert failed. First exception on row 0; first error: REQUIRED_FIELD_MISSING, Required fields are missing: [Account__c]: [Account__c]

  Test_PrimaryAddressValidationTriger.testCreateShipToAddress System.DmlException: Insert failed. First exception on row 0; first error: CANNOT_INSERT_UPDATE_ACTIVATE_ENTITY, mainShipToAddessTrigger: execution of BeforeInsert
caused by: System.QueryException: List has no rows for assignment to SObject

Trigger.mainShipToAddessTrigger: line 9, column 1: []
  Test_ShiptoAddressTrigger.testCreateShipToAddress System.DmlException: Insert failed. First exception on row 0; first error: CANNOT_INSERT_UPDATE_ACTIVATE_ENTITY, mainShipToAddessTrigger: execution of BeforeInsert
caused by: System.QueryException: List has no rows for assignment to SObject

Trigger.mainShipToAddessTrigger: line 9, column 1: []
  WineClubMembershipAccountPopulateTest.PositiveTest System.DmlException: Insert failed. First exception on row 0; first error: INVALID_FIELD_FOR_INSERT_UPDATE, Business Customer may not use Person Customer field  : WC Tenure: [WC Tenure]
 

@isTest
private class Test_ContactWineClub {

    static testMethod void myUnitTest() {

	date myDate = date.today();
	
        Account a = new Account(Name = 'Test MainContactTrigger', RecordTypeID = '0121W000000UgfA');
 //       a.RecordType = 'Household';
        insert a;
        
        Contact c = new Contact(AccountID = a.id, firstName = 'Test MainContactTrigger', lastName = 'Tester', email = 'testfake@gmail.com');
        insert c;
        
 //       System.debug('Contact record num: ' + [SELECT Id FROM Contact].size());
        
        Wineclub_Membership__c wc = new Wineclub_Membership__c( Contact__c = c.id, Active__c = true , Wine_Club_Code__c = 'Collection 2 Bottle', Start_Date__c = myDate);
        insert wc;
        
             
        c = [select AccountId, Account.Name from Contact where id = :c.id limit 1];
           System.assertEquals('Test MainContactTrigger', a.Name);
           System.assertEquals(1, [SELECT Id FROM Contact].size());
           System.assertEquals(a.id, c.AccountId);
     
     
    }
}

@isTest
private class Test_PrimaryAddressValidationTriger {

    @isTest
    public static void testCreateShipToAddress(){
        Account a = new Account(Name = 'Test PrimaryAddressValidation', RecordTypeID = '0121W000000UgfA');
        insert a;
        
        Contact c = new Contact(AccountID = a.ID, firstName = 'Test PrimaryAddressValidation', lastName = 'Tester', email = 'fakington@gmail.com');
        insert c;
        
        ShipTo_Address__c s1 = new ShipTo_Address__c( Contact__c = c.id,
           Address__c = '1919 Fakeone Way',
           City__c = 'Fakington',
           State__c = 'CA',
           Country__c = 'USA',
           ZIP__c = '00000',
           Primary_Billing_Address__c = true);
  
        insert s1;
   
    	ShipTo_Address__c s2 = new ShipTo_Address__c( Contact__c = c.id,
           Address__c = '1600 Alrington Way',
           City__c = 'Oakland',
           State__c = 'CA',
           Country__c = 'USA',
           ZIP__c = '00000',
           Default_Shipping_Address__c = true);        
   
   		insert s2;
   		
        c = [select AccountID,Account.Name from Contact where id = :c.id limit 1];
           System.assertEquals('Test PrimaryAddressValidation', c.Account.Name);
           System.assertEquals(a.id, c.AccountID);
    }

}

@isTest
public with sharing class Test_ShiptoAddressTrigger {
    @isTest
    public static void testCreateShipToAddress(){
        Account a = new Account(Name = 'Test MainShipToAddressTrigger', RecordTypeID = '01240000000UZ4V');
        insert a;
        
        Contact c = new Contact(AccountID = a.ID, firstName = 'Test MainShipToAddressTrigger', lastName = 'Tester', email = 'fakington@gmail.com');
        insert c;
        
        ShipTo_Address__c s1 = new ShipTo_Address__c( Contact__c = c.id,
           Address__c = '1919 Fakeone Way',
           City__c = 'Fakington',
           State__c = 'CA',
           Country__c = 'USA',
           ZIP__c = '00000',
           Primary_Billing_Address__c = true);
  
        insert s1;
   
    	ShipTo_Address__c s2 = new ShipTo_Address__c( Contact__c = c.id,
           Address__c = '1919 Fakeone Way',
           City__c = 'Fakington',
           State__c = 'CA',
           Country__c = 'USA',
           ZIP__c = '00000',
           Default_Shipping_Address__c = true);        
   
   		insert s2;
   		
        c = [select AccountId,Account.Name from Contact where id = :c.id limit 1];
           System.assertEquals('Test MainShipToAddressTrigger', c.Account.Name);
           System.assertEquals(a.id, c.AccountId);
    }
}

@isTest
public class WineClubMembershipAccountPopulateTest {

    @testSetup
    static void setup(){
        Account acc = new Account();
        acc.Name = 'Test1';
        insert acc;
        
        Contact con = new Contact();
        con.AccountId = acc.id;
        con.lastName = 'Test1';
        insert con;
        
        Wineclub_Membership__c wineClub = new Wineclub_Membership__C();
        wineClub.Account__c = acc.id;
        wineClub.Contact__c = con.id;
        insert wineClub;
    }
    
    @isTest
    static void PositiveTest() {
        Test.startTest();
        database.executeBatch(new WineClubMembershipAccountPopulate(), 200);
        Test.stopTest();
        
        Wineclub_Membership__c wineClub = [SELECT Id, account__c, contact__c FROM Wineclub_Membership__c Limit 1];
        System.assertNotEquals(null, wineClub.account__c);
    }
}

Any help is greatly appreciated as we are having integration issues with missing data and unable to update my main class and trigger since the above are causing me errors when trying to deploy to production