Here is the stack trace:

Bug(creditcooperatif): Blank page instead of the TransferPage
Traceback (most recent call last):
  File "/home/adrien/Dev/weboob/weboob/core/bcall.py", line 94, in backend_process
    result = function(backend, *args, **kwargs)
  File "/home/adrien/Dev/weboob/weboob/tools/application/base.py", line 318, in _do_complete
    res = getattr(backend, function)(*args, **kwargs)
  File "/home/adrien/Dev/weboob/weboob/capabilities/bank.py", line 916, in transfer
    t = self.init_transfer(transfer, **params)
  File "/home/adrien/Dev/weboob/modules/caissedepargne/module.py", line 103, in init_transfer
    return self.browser.otp_sms_continue_transfer(transfer, **params)
  File "/home/adrien/Dev/weboob/weboob/browser/switch.py", line 91, in wrapper
    return val(*args, **kwargs)
  File "/home/adrien/Dev/weboob/weboob/browser/browsers.py", line 824, in inner
    return func(browser, *args, **kwargs)
  File "/home/adrien/Dev/weboob/modules/caissedepargne/browser.py", line 1327, in otp_sms_continue_transfer
    assert False, 'Blank page instead of the TransferPage'
AssertionError: Blank page instead of the TransferPage

Here is my use case:

• I have two backends, boursorama and creditcooperatif
• Launched with /home/adrien/Dev/weboob/tools/local_run.sh boobank --nss
• List accounts
• Getting history of a boursorama account
• Getting history of a creditcooperatif account
• List accounts
• Enable logging debug
• Start a transfer with `transfer 12 FR76XXXX@creditcooperatif 10 "Reason"
• The confirmation is shown
• The OTP code is asked, I receive the SMS and enter it
• PAF, pastèque.
• boobank exits immediately.

I restart boobank and do the following:

• List accounts
• Getting history of the creditcooperatif account
• List accounts
• Start a transfer as above
• Everything works as expected, the transfer is OK.

As a small glitch, I have this transfer confirmation:

------- Transfer 6663876@creditcooperatif -------
Date:       2020-05-16
Origin:     None
Recipient:  None
Amount:     10 EUR
Label:      Reason

As you can see, Origin and Recipient are missing. I don't know if it's linked.