Google script custom trigger onEdit(e) issue - google-apps-script

Question

I am getting error in line 29. But the same code works when pasted in another sheet. Separate trigger is used. Edit-> Current project's trigger.
var Team_email='abc#gmail.com';
function TriggerOnEdit(e)
{
Logger.log("stg1");
sendEmailOnassigned(e);
}
function showMessageOnApproval(e)
{
var edited_row = checkStatusIsAssigned(e);
if(edited_row > 0)
{
SpreadsheetApp.getUi().alert("Row # "+edited_row+" approved!");
}
}
function showMessageOnUpdate(e)
{
var range = e.range;
SpreadsheetApp.getUi().alert("range updated " + range.getA1Notation());
}
function checkStatusIsAssigned(e)
{
Logger.log("stg3");
var range = e.range;
if(range.getColumn() <= 12 &&
range.getLastColumn() >=12 )
{
var edited_row = range.getRow();
var status = SpreadsheetApp.getActiveSheet().getRange(edited_row,11).getValue();
if(status == 'Assigned')
{
return edited_row;
}
}
return 0;
}
function sendEmailOnassigned(e)
{
Logger.log("stg2");
var approved_row = checkStatusIsAssigned(e);
if(approved_row <= 0)
{
return;
}
Logger.log("stg4");
sendEmailByRow(approved_row);
}
function sendEmailByRow(row)
{
Logger.log("stg5");
var values = SpreadsheetApp.getActiveSheet().getRange(row,1,row,13).getValues();
var row_values = values[0];
var mail = composeAssignedEmail(row_values);
MailApp.sendEmail(Team_email,mail.subject,mail.message);
var Requester_email = composeRequesterEmail(row_values);
MailApp.sendEmail(Requester_email.email,Requester_email.subject,Requester_email.message);
}
function composeAssignedEmail(row_values)
{
Logger.log("stg6");
var Request_Number = row_values[1];
var email = row_values[2];
var Project_Name = row_values[4];
var Nature_Of_Work = row_values[5];
var Quantity = row_values[6];
var Estimated_Hours = row_values[7];
var Name = row_values[12];
var message = "Hello Requester, \n "+" \n The following Resource "+ Name ;
var subject = "Request_Number - " + Request_Number ;
return({message:message,subject:subject});
}
function composeRequesterEmail(row_values)
{
Logger.log("stg7");
var Request_Number = row_values[1];
var email = row_values[2] ;
var Project_Name = row_values[4];
var Nature_Of_Work = row_values[5];
var Quantity = row_values[6];
var Estimated_Hours = row_values[7];
var Name = row_values[12];
var message = "Hello Requester, \n "+" \n The following Resource "+ Name;
var subject = "Request_Number - " + Request_Number;
return({message:message,subject:subject, email:email });
}
Please tell me the error where is the mistake.
We can not use debug function to understand the mistake. because trigger is on edit.
Also when we use 'e' what are the information do we feed the function?
How to correct this?