Hi,

In Odoo, if a field (like self.writing_file_transfer) has no value set, it defaults to False, which is a boolean. When Python reaches the line

self.writing_file_transfer + str(self.id) + '.csv'

It tries to do False + "123.csv", but Python cannot add a boolean to a string, so it raises TypeError. In other words, the error is not because the code itself is wrong, but because the field has no value (so it became False) and Python doesn’t know how to concatenate False with text. To fix this, you must explicitly handle the case when the field is empty, e.g. str(self.writing_file_transfer or ''), so it uses an empty string instead of False.

Hope it helps.

Hello Gowtham A,

I hope you're doing well.

The error occurs because self.writing_file_transfer is a boolean (True or False), and you're trying to concatenate it with a string   (str(self.id) + '.csv'). Since Python does not allow direct concatenation of a boolean and a string, it raises a TypeError.

Convert self.writing_file_transfer to a string before concatenation:

{'name': str(self.writing_file_transfer) + str(self.id) + '.csv', 'type': 'binary', 'public': True,

'datas': base64.encodebytes(fp.getvalue()), }

I hope this resolves your issue.

Thanks & Regards,

Email:  odoo@aktivsoftware.com           

Skype: kalpeshmaheshwari

if you check type of 

self.writing_file_transfer	​

its may Boolean and you are trying to add Boolean and string 
try this :

str(self.writing_file_transfer)