name data is not defined

This error message usually occurs when you try to reference a variable that has not been defined or assigned a value in your code. To fix the error, you need to define the variable before using it in your code. You can also check for any typos in the variable name.

For example, if you have the following code:

print(name)

You will get a "NameError: name 'name' is not defined" error message because the variable "name" has not been defined. To fix this, you can define the variable by assigning it a value:

name = "John"
print(name)

This will output "John" without any error message.