Fix an issue in Google Apps Script

Job ID: 31412889

Budget: $10 – $30 CAD

We have a Google Apps Script for a google sheet that is supposed to be able to send multiple email at once. However, when I click submit the error I get is "Cannot read property Split of undefined". I would need you to fix the code so that the sheet can send emails easily to as many recipients as we set. Please view the sheet and the code here: https://docs.google.com/spreadsheets/d/162ByhuF7JUa1-AsEC1bx31AVdDNl82uUz13zHhXPeN4/edit?usp=sharing

The budget for the project is $10 USD

Req.F - 1.0 Get the excel sheet send emails

--> When the user clicks "Send Retro Emails" then the email should be sent to each "Client Email" with no errors
--> The functionality is already there, the developer will only need to remove errors and bugs so that the emails can easily be sent
Test.F - 1.0:
--> Step 1: Create X number of columns with different emails
--> Step 2: Click "Send Retro Emails" button
--> Step 3: Login to each email and see if the email was actually delivered.

Budget for this is $10 USD. Please write "Love Copilot" in the entry so that I know you read the description.
Related categories: JavaScript HTML Scripting Excel Macros Google Sheets