What is the solution to Plesk RoundCube Horde No input file specified error?

To solve the error, we first connect to our server via SSH and execute the following commands.

nano /etc/psa-webmail/horde/horde/php.ini
nano /etc/psa-webmail/roundcube/php.ini

We are closing open_basedir.

;open_basedir = "/tmp"

Afterwards, we reconfigure the psa using the following command.

plesk repair web -y -v

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