Roundcubemail reports "Invalid Request. No data was saved"

[DrMartinus]

Hi,

when trying to log in, I get since recently the following message:

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Invalid Request. No data was saved (I translated this from German, so I am not sure if it's the correct wording)

I wonder if this has to do with PHP being updated to 7.4.9 recently. In the wake of this, I would like to update roundcubemail, as I noticed that the server is running an older version (1.3.7). Maybe that will solve the problem already. But I am not sure how to do this on a remote server.

Here are entries from the errors log:

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[10-Aug-2020 13:35:55 Europe/Berlin] PHP Warning:  session_start(): Failed to read session data: user (path: /path/to/php/session) in /path/to/Roundcube/rcube_session.php on line 117
[10-Aug-2020 13:35:55 Europe/Berlin] PHP Warning:  count(): Parameter must be an array or an object that implements Countable in /path/to/Roundcube/rcube_plugin_api.php on line 406
[10-Aug-2020 13:35:55 Europe/Berlin] PHP Warning:  count(): Parameter must be an array or an object that implements Countable in /path/to/Roundcube/rcube_plugin_api.php on line 406
the above error appears many times...
[10-Aug-2020 13:35:55 Europe/Berlin] PHP Warning:  Creating default object from empty value in /path/to/Roundcube/html.php on line 715
[10-Aug-2020 13:35:55 Europe/Berlin] PHP Warning:  count(): Parameter must be an array or an object that implements Countable in /path/to/Roundcube/rcube_plugin_api.php on line 406
again the above error appears many times
[10-Aug-2020 13:35:55 Europe/Berlin] PHP Warning:  Use of undefined constant E2 - assumed 'E2' (this will throw an Error in a future version of PHP) in /path/to/Roundcube/rcube_utils.php on $
[10-Aug-2020 13:35:55 Europe/Berlin] PHP Warning:  Use of undefined constant A8 - assumed 'A8' (this will throw an Error in a future version of PHP) in /path/to/Roundcube/rcube_utils.php on $
[10-Aug-2020 13:35:55 Europe/Berlin] PHP Warning:  Use of undefined constant E2 - assumed 'E2' (this will throw an Error in a future version of PHP) in /path/to/Roundcube/rcube_utils.php on $
[10-Aug-2020 13:35:55 Europe/Berlin] PHP Warning:  Use of undefined constant A9 - assumed 'A9' (this will throw an Error in a future version of PHP) in /path/to/Roundcube/rcube_utils.php on $
[10-Aug-2020 13:35:55 Europe/Berlin] PHP Warning:  count(): Parameter must be an array or an object that implements Countable in /path/to/Roundcube/rcube_plugin_api.php on line 406


Any help or suggestions where to look would be appreciated.

[JohnDoh]

PHP Warning:  session_start(): Failed to read session data: user (path: /path/to/php/session) in /path/to/Roundcube/rcube_session.php on line 117

suggests an error in your php config to me but you should probably upgrade roundcube as well as there are some php7.4 compatibility fixes in 1.4.

[DrMartinus]

suggests an error in your php config to me but you should probably upgrade roundcube as well as there are some php7.4 compatibility fixes in 1.4.

Could you be a bit more specific about the php config error?
I'll go for the update, but I need to make sure roundcube works with ISPConfig which is the manager for websites and email accounts. I guess I need to wait for info from the ISPConfig side in order to go ahead with the update. And maybe the config error may also be something I need to take care of in order to make it work again. Hence it would be nice to know more about possible mistakes in the config.

[JohnDoh]

you have the full error message from php what more info do you need?