Hi Team,

I am getting this error in the this flow:

Flow Details
Flow Name: Update_Meeting
Type: Screen Flow
Version: 59
Status: Active
Org: Peninsula Employment Services Limited (00D0t0000000VPq)
Flow Interview Details
Interview Label: Update Meeting 06/11/2018 1:31 PM
Current User: Ciaran Adams (0056A000001JpYy)
Start time: 06/11/2018 1:31 PM
Duration: 5 seconds
How the Interview Started
Ciaran Adams (0056A000001JpYy) started the flow interview.
Some of this flow's variables were set when the interview started.
EventID = 00U0t000002gb8dEAA
FAST LOOKUP: Find_Event
Find all Event records where:
Id Equals {!EventID} (00U0t000002gb8dEAA)
Assign those records to {!Event}.
Save these field values in the variable: WhoId, Meeting_Status__c, WhatId, OwnerId, ActivityDate, ActivityDateTime, StartDateTime, CreatedDate, Meeting_Type__c, Booking_Lead_Source__c, Booking_Follow_Up_Stage__c, Lead__c
Result
Successfully found records.
SCREEN: Screen_Update_Status
Display Text: CurrentStatus
Value at run time:
The current meeting status is: Booked


Dropdown List: Select_Meeting_Status
Label:
Meeting Result

Data Type: Text
Choices selected at runtime:
Choice selected at runtime: Cancelled (Choice_Status)
Value of choice: Cancelled


Selected Navigation Button: NEXT
DECISION: Is_Booked
Skipped this outcome because its conditions weren't met: Booked
Outcome conditions:
{!Select_Meeting_Status} (Cancelled) Equals Booked

Executed the default outcome
RECORD QUERY: Find_Lead
Find one Lead record where:
Id Equals {!Event.WhoId} (0030t00000l62PXAAY)
Result
Failed to find record.
DECISION: Is_Last_BST_Null
Skipped this outcome because its conditions weren't met: LastBST_not_Null
Outcome conditions:
{!LastBSTID} (null) Is null false

Executed the default outcome
RECORD QUERY: Get_Last_Event_BST
Find one Event record where:
Id Equals {!EventID} (00U0t000002gb8dEAA)
Result
Successfully found record.
{!LastBSTID} = 0056A000001KzrsQAC
FAST LOOKUP: Get_BST
Find all User records where:
Id Equals {!LastBSTID} (0056A000001KzrsQAC)
Assign those records to {!BST}.
Save these field values in the variable: IsActive
Result
Successfully found records.
DECISION: Is_BST_Active
Executed this outcome: BST_is_Active
Outcome conditions:
{!BST.IsActive} (true) Equals true
SCREEN: Screen_Meeting_Outcome
Dropdown List: Select_Meeting_Outcome
Label:
Meeting Outcome

Data Type: Text
Choices selected at runtime:
Choice selected at runtime: BDM was running late, prospect couldn't meet later. (DependentPicklist_Outcome)
Value of choice: Can_BDMC_Running_late
Field assignments:
{!TempID} = Dependent_Field_Value__c (Can_BDMC_Running_late)


Selected Navigation Button: NEXT
RECORD UPDATE: Update_Event_Not_Booked
Find all Event records where:
Id Equals {!EventID} (00U0t000002gb8dEAA)
Update the records’ field values.
Meeting_Outcome_Details__c = {!Select_Meeting_Outcome} (BDM was running late, prospect couldn't meet later.)
Meeting_Status__c = {!Select_Meeting_Status} (Cancelled)
Result
All records that meet the filter criteria are ready to be updated when the next Screen or Wait element is executed or when the interview finishes.
DECISION: Was_Cancelled
Executed this outcome: Cancelled
Outcome conditions:
1. {!Select_Meeting_Status} (Cancelled) Equals Not_Shown
2. {!Select_Meeting_Status} (Cancelled) Equals Cancelled
Logic: One condition must be true (OR)
RECORD CREATE: Create_Cancelled_Meeting_Task
Create one Task record where:
ActivityDate = {!$Flow.CurrentDate} (November 6, 2018)
Booked_For__c = {!Event.OwnerId} (0056A000001J2WlQAK)
Booked_On__c = {!Event.CreatedDate} (06/11/2018 12:58 PM)
Booking_Date__c = {!Event.StartDateTime} (06/11/2018 1:00 PM)
Booking_Follow_Up_Stage__c = {!Event.Booking_Follow_Up_Stage__c} (null)
Booking_Lead_Source__c = {!Event.Booking_Lead_Source__c} (null)
Lead__c = {!Event.Lead__c} (null)
Meeting_Outcome_Details__c = {!Select_Meeting_Outcome} (BDM was running late, prospect couldn't meet later.)
Meeting_Status__c = {!Select_Meeting_Status} (Cancelled)
Meeting_Type__c = {!Event.Meeting_Type__c} (Prospect - Follow Up)
OwnerId = {!LastBSTID} (0056A000001KzrsQAC)
Priority = High
RecordTypeId = 0126A000000t4pFQAQ
Status = Open
Subject = Cancelled Meeting - {!LeadCompany} (Cancelled Meeting - )
WhatId = {!Event.WhatId} (0060t00000DiBskAAF)
WhoId = {!Event.WhoId} (0030t00000l62PXAAY)
Result
A record is ready to be created when the next Screen or Wait element is executed or when the interview finishes.
{!TaskID} = 00T0t00000AJLjyEAH
RECORD UPDATE: Update_BDM_Cancelled_Date
Find all Lead records where:
Id Equals {!LeadId} (null)
Update the records’ field values.
BDM_Cancelled_from_Client__c = {!Event.StartDateTime} (06/11/2018 1:00 PM)
Result
All records that meet the filter criteria are ready to be updated when the next Screen or Wait element is executed or when the interview finishes.
RECORD UPDATE: Mark_For_Deletion
Find all Event records where:
Id Equals {!EventID} (00U0t000002gb8dEAA)
Update the records’ field values.
Subject = Delete: {!LeadCompany} (Delete: )
Result
All records that meet the filter criteria are ready to be updated when the next Screen or Wait element is executed or when the interview finishes.
RECORD DELETE: Delete_Event
Delete all Event records where:
Id Equals {!EventID} (00U0t000002gb8dEAA)
Result
Failed to delete records that meet the filter criteria.

Error Occurred: The flow tried to delete these records: null. This error occurred: INSUFFICIENT_ACCESS_OR_READONLY: insufficient access rights on object id. You can look up ExceptionCode values in the SOAP API Developer Guide (https://developer.salesforce.com/docs/atlas.en-us.api.meta/api/sforce_api_calls_concepts_core_data_objects.htm).

I am not getting this error as a Salesforce Admin but other users are getting them and I am wondering where is the permission or sharing rule that is missing in this puzzle. Any recommendation where should I look?

Thanks,