Trailhead processing engine is throwing following error, when I am working on "Lightning Experience Specialist" Superbadge Step #4

Challenge Not yet complete... here's what's wrong: 
The Fulfillment Creation process does not appear to be working properly. Please check that your fulfillment was created with all of the proper field value specified in the requirements.

I completed all steps according to requirement and couldnot find where is the error, Any help is highly appreciated.

My Developement work:

Object - Adventure Package
Start Process- Only when a record is created 

FIRST NODE 

Define Criteria for this Action Group 

Criteria for Executing Actions - Conditions are met 

Set Conditions:

1. [OpportunityLineItem].Oppotunity.StageName Does not equal Cancelled 
2. [OpportunityLineitem].Fulfillment_Created_c Equals False

Conditions - All of the conditions are met (AND) 

IMMEDIATE ACTIONS 

1. Create a Record 

Record Type - Fulfillment 

Set Field Values 

AdventurePackageId -  Reference -[OpportunityLineItem].Id
Adventure Package cost - Reference - [OpportunityLineItem].TotalPrice 
Adventure - Reference -  [OpportunityLineItem].Product2Id
Expedition Leader - Reference -[OpportunityLineItem].Product2.Expedition_Leader_c
Explorer - Reference - [OpportunityLineItem].Explorer_C
Fulfillment Name - Formula -[OpportunityLineItem].Product2.Name + [OpportunityLineItem].Id
Opportunity-  [OpportunityLineItem].OpportunityId
Schedule Date -Reference - [OpportunityLineItem].ServiceDate
Status- Picklist - New 


2. Update Records

Record - [OpportunityLineItem].Opportunity ID 

No criteria just update records 

Set new fields for the records you update 

Needs Insurance - Reference- [OpportunityLineItem].Product2.Needs_Insurance_c
Needs waiver - Reference -  [OpportunityLineItem].Product2.Needs_Waiver_c

3. Update Records 

Record - [OpportunityLineItem]

Criteria for Updating Records - No criteria-just update records 

Set new field values for the records you update 

Fulfilment Created = True 

Evaluate the Next Criteria 

 SECOND NODE 


EVALUATE THE NEXT CRITERIA 

Define Criteria for this Action Group 

Criteria for Executing Actions - Conditions are met 

Set Conditions:

1. [OpportunityLineItem].Explorer_c   Is Null  = True 

Conditions - All of the conditions are met (AND)

IMMEDIATE ACTIONS 

Create a Record - Task 

Set Field Values

Assigned to ID - reference- [OpportunityLineItem].Opportunity.OwnerId
Related to ID - reference -[OpportunityLineItem].Opportunity.Id
Priority - Normal 
Status - Not started 
Subject- String - Update explorer 

SCHEDULED ACTIONS 

14 days from now 

Post to Chatter 

User - Select a user from a record - [OpportunityLineItem].Opportunity.Owner.Id

Message:

{![OpportunityLineItem].Opportunity.Name}

{![OpportunityLineItem].Product2.Name}

{![OpportunityLineItem].Id}

Any pointers or Ideas?