Flask - jinja2.exceptions.UndefinedError: 'employee' is undefined - flask

Question

I have a page that displays Employees Masterlist and I wanted to do is when I clicked the Employee No. it will view the timesheet of that employee.
I tried using this as the result of my research.
In my routes.py
#app.route("/employee/<int:employee_id>")
def employee(employee_id):
employee = Employee.query.get_or_404(employee_id)
return render_template('emp_timesheet.html', employee=employee)
Here is my masterlist.html
{% extends 'header.html' %}
{% block content %}
<table width="100%" class="table table-striped table-bordered table-hover" id="dataTables-example">
<thead>
<tr>
<th>Employee Number</th>
<th>Name</th>
<th>Contract</th>
<th>Position</th>
<th>Salary</th>
</tr>
</thead>
<tbody>
{% for employee in list_employee %}
<tr class="odd gradeX">
<td>{{ employee.employee_number }}</td>
<td>{{ employee.last_name }}, {{ employee.first_name }}</td>
<td>{{ employee.contract }}</td>
<td class="center">{{ employee.title }}</td>
<td class="center">{{ employee.salary }}</td>
</tr>
{% endfor %}
</tbody>
</table>
{% endblock %}
But I'm getting this error:
File "/home/jxmtsi/Desktop/flask_training/rep/templates/header.html", line 293, in top-level template code
{% block content %}{% endblock %}
File "/home/jxmtsi/Desktop/flask_training/rep/templates/masterlist.html", line 27, in block "content"
<td>{{ employee.employee_number }}</td>
File "/home/jxmtsi/.local/lib/python3.6/site-packages/jinja2/environment.py", line 430, in getattr
return getattr(obj, attribute)
jinja2.exceptions.UndefinedError: 'employee' is undefined

Answer 1

I think, that a problem is in your Python code, more precisely in a communication between your application and SQL base. Or, maybe, you do not have in SQL database a data about requested employee_id.
Check, does variable employee in method employee (employee_id) is receiving data from your database. For example, try print(employee.last_name):
#app.route("/employee/<int:employee_id>")
def employee(employee_id):
employee = Employee.query.get_or_404(employee_id)
print(employee.last_name) # or print other value from table (Model) Employee
# print(employee.id)
return render_template('emp_timesheet.html', employee=employee)