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p_mcdermottp_mcdermott 

My users are encountering an error in a Flow on a custom object that has worked in the past, but now is not working even though no changes have been made in Flow Designer.

Disclaimer: I am relatively new to Salesforce and although I have admin. experience (1 year), I am quite new to the Salesforce development space. I'm certainly up for learning by doing and am not afraid to jump in to a problem, but if you could breakdown any response into small, digestible pieces so I can troubleshoot myself, I would be very appreciative. 
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My users are encountering an error in a Flow that is a component on a Lightning Record Page for a custom object that has worked in the past, but now is not working even though no changes have been made in Flow Designer.

Here is the error message I am receiving:

Error element Update_first_and_last_Dates (FlowAssignment).
The flow failed to access the value for oClassScheduleTemplate.Starting_Date__c because it hasn't been set or assigned.
Flow Details
Flow API Name: Convert_Plan_to_Class
Type: Screen Flow
Version: 42
Status: Active
Org: Common Threads (00D1I000000lJRt)
Flow Interview Details
Interview Label: Convert Plan to Class 10/20/2019 3:27 PM
Current User: Patrick McDermott (0051I000002GUR2)
Start time: 10/20/2019 3:27 PM
Duration: 20 seconds
How the Interview Started
Patrick McDermott (0051I000002GUR2) started the flow interview.
Some of this flow's variables were set when the interview started.
plannerId = a0v1I00000BmGh3QAF
FAST LOOKUP: Get_Planner_for_validation_Check
Find all Progam_Planning__c records where:
Id Equals {!plannerId} (a0v1I00000BmGh3QAF)
Store those records in {!ProgramPlanner}.
Save these field values in the variable: State__c, How_do_you_plan_to_facilitate__c, How_many_student_groups_will_be_doing_Sm__c, How_will_the_Small_Bites_be_scheduled__c, Application__c, Organization__c, Main_Contact__c
Result
Successfully found records.
SCREEN: Not_Ready_For_Conversion
Display Text: notReadyText
Value at run time:

Click Next to start creating classes from this Planning form.


Selected Navigation Button: NEXT
GET RECORDS: Get_Partner_User_Id
Find one User record where:
ContactId Equals {!ProgramPlanner.Main_Contact__c} (0031I00000vbREvQAM)
Result
Successfully found record.
{!partnerUserId} = 0051I0000056QmTQAU
FAST LOOKUP: GetEducators
Find all Program_Educator__c records where:
Program_Plan__c Equals {!plannerId} (a0v1I00000BmGh3QAF)
Store those records in {!oEducators}.
Save these field values in the variable: Id, Contact__c
Result
Successfully found records.
FAST LOOKUP: GetSchedules
Find all Planning_Schedule__c records where:
Progam_Planning__c Equals {!plannerId} (a0v1I00000BmGh3QAF)
Store those records in {!oSchedules}.
Save these field values in the variable: Program_Educator__c, Starting_Date__c, End_Date__c, Date_8__c, Date_1__c, Date_2__c, Date_3__c, Date_4__c, Date_5__c, Date_6__c, Date_7__c
Result
Successfully found records.
LOOP: loopEducators
Loop Through: [a0x1I000002QP8FQAW,a0x1I000002QP8KQAW]
Iteration: 0
Current value of {!oEducator}: a0x1I000002QP8FQAW
FAST LOOKUP: Cet_Contact
Find all Contact records where:
Id Equals {!oEducator.Contact__c} (0031I00000bOuC8QAK)
Store those records in {!oContact}.
Save these field values in the variable: FirstName, Id, LastName, Email
Result
Successfully found records.
ASSIGNMENT: Add_Contaqct_To_Collection
{!oEducatorContacts} Add {!oContact}
Result
{!oEducatorContacts} = "[Contact (0031I00000bOuC8QAK)]"
LOOP: loopEducators
Loop Through: [a0x1I000002QP8FQAW,a0x1I000002QP8KQAW]
Iteration: 1
Current value of {!oEducator}: a0x1I000002QP8KQAW
FAST LOOKUP: Cet_Contact
Find all Contact records where:
Id Equals {!oEducator.Contact__c} (0031I00000wSNnUQAW)
Store those records in {!oContact}.
Save these field values in the variable: FirstName, Id, LastName, Email
Result
Successfully found records.
ASSIGNMENT: Add_Contaqct_To_Collection
{!oEducatorContacts} Add {!oContact}
Result
{!oEducatorContacts} = "[Contact (0031I00000bOuC8QAK),Contact (0031I00000wSNnUQAW)]"
LOOP: loopEducators
End Loop.
SCREEN: Create_ClassSummary
Number: Number_of_Classes
Label: Number of Classes to Create
Value at run time: 8

Display Text: PlannerSummaryDetails
Value at run time:

Facilitate:
Multiple educators will deliver in self-contained classrooms
Schedule:
Over a set period of time


Selected Navigation Button: NEXT
ASSIGNMENT: Set_Total_Classesto_create
{!ClassesToCreateRemaining} Equals {!Number_of_Classes}
Result
{!ClassesToCreateRemaining} = "8.00"
ASSIGNMENT: SetNumberOfLessons
{!iNumberOfLessons} Equals 8
Result
{!iNumberOfLessons} = "8"
SCREEN: Select_Educator
Display Text: educatorSelectText
Value at run time: For Class 1 of 8 please select which Planning Educator will be the instructor.

Dropdown List: InstructorSelect
Label: Instructor
Data Type: Text
Choices selected at runtime:
Choice selected at runtime: Mary Austin (choiceEducatorChoices)
Choice value: 0031I00000bOuC8QAK


Dropdown List: ProgramToImplement
Label: Program
Data Type: Text
Choices selected at runtime:
Choice selected at runtime: After School Small Bites - School Partner (chPrograms)
Choice value: a0q1I000001WgW1QAK


Dropdown List: Level
Label: Level
Data Type: Text
Choices selected at runtime:
Choice selected at runtime: Pre-Kindergarten (GradeLevelChoices)
Choice value: Pre-Kindergarten


Number: Adult_Count
Label: Adult Count
Value at run time:

Number: Student_Count
Label: Student Count
Value at run time:

Selected Navigation Button: NEXT
FAST LOOKUP: Get_Educator
Find all Program_Educator__c records where:
Contact__c Equals {!InstructorSelect} (Mary Austin)
Program_Plan__c Equals {!plannerId} (a0v1I00000BmGh3QAF)
Store those records in {!oEducator}.
Save these field values in the variable: Name, Id, Contact__c, Program_Plan__c, Contact_Name__c
Result
Successfully found records.
DECISION: What_Schedule_To_Use
Outcome executed: one_date_range
Outcome conditions:
{!ProgramPlanner.How_will_the_Small_Bites_be_scheduled__c} (Over a set period of time) Equals Over a set period of time
FAST LOOKUP: get_singleSchedule_0
Find all Planning_Schedule__c records where:
Progam_Planning__c Equals {!plannerId} (a0v1I00000BmGh3QAF)
Store those records in {!oClassScheduleTemplate}.
Save these field values in the variable: Date_1__c, Date_2__c, Date_3__c, Date_4__c, Date_5__c, Date_6__c, Date_7__c, Date_8__c
Result
Successfully found records.
Salesforce Error ID: 1136234990-294355 (-1423371545)

From my cursory, and albeit novice reading of the error message, I can't determine what needs to be fixed to resolve the error. Any help would be much appreciated. 

Thank you! 
Filip Poverud 4Filip Poverud 4
Hi, I'm also a novice when it comes to SF and troubleshooting, but if you look at the prior steps where you save records you see that they all end with Successfully found records and then the next step in the Flow starts. Out of this log, I assume it was the e-mail sent to you, I would start lookig at the step in the Flow where you save records to oClassScheduleTemplae and verify that they are successfully saved to eliminate that object from the root cause. Then I would examine the next expected step and its variables/objects to see if something may have changed other places in your system. I tried to search for the Error ID but could not find any useful information.

with Regards
Filip Poverud
Filip Poverud 4Filip Poverud 4
I forgot to add that you could also enable debugging for your Flow in order to get more details of what is happening :)
p_mcdermottp_mcdermott
Thanks for the help Filip.