Just suddenly stopped working

Hi it was working fine and then suddenly when trying to send a quote i am getting this error message.

A PHP Error was encountered

Severity: Warning

Message: unlink(/home/tlclandscaping/public_html/invoice/uploads/temp/mpdf): Is a directory

Filename: helpers/mpdf_helper.php

Line Number: 130

Backtrace:

File: /home/tlclandscaping/public_html/invoice/application/helpers/mpdf_helper.php
Line: 130
Function: unlink

File: /home/tlclandscaping/public_html/invoice/application/helpers/pdf_helper.php
Line: 257
Function: pdf_create

File: /home/tlclandscaping/public_html/invoice/application/helpers/mailer_helper.php
Line: 110
Function: generate_quote_pdf

File: /home/tlclandscaping/public_html/invoice/application/modules/mailer/controllers/Mailer.php
Line: 208
Function: email_quote

File: /home/tlclandscaping/public_html/invoice/index.php
Line: 327
Function: require_once
A PHP Error was encountered

Severity: Warning

Message: Cannot modify header information - headers already sent by (output started at /home/tlclandscaping/public_html/invoice/vendor/codeigniter/framework/system/core/Exceptions.php:271)

Filename: helpers/url_helper.php

Line Number: 564

Backtrace:

File: /home/tlclandscaping/public_html/invoice/application/modules/mailer/controllers/Mailer.php
Line: 213
Function: redirect

File: /home/tlclandscaping/public_html/invoice/index.php
Line: 327
Function: require_once

i did successfully send the quote once.
I tried to send it again and got the above message.
I then changed the status to a draft and tried again.
Still the same message.

I then created a new quote.
Still the same error message

https://community2.invoiceplane.com/t/topic/4663