Unable to open message in Horde webmail: Class 'Math_BigInteger' not found

Created:

2016-11-16 12:41:26 UTC

Modified:

2017-08-08 13:29:39 UTC

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Unable to open message in Horde webmail: Class 'Math_BigInteger' not found

Applicable to:

  • Plesk 12.0 for Linux

Symptoms

Unable to open one or few messages in Horde webmail, this error is shown instead of message in new window:

Class 'Math_BigInteger' not found [pid 7517 on line 172 of "/usr/share/psa-pear/pear/php/Horde/Mapi.php"]

Also this error message is shown:

Error when communicating with the server

Cause

This is a software issue with internal id PPPM-3090 and it will be fixed in further Plesk updates.

Resolution

As workaround, install and copy this module to required directory:

# /usr/share/psa-pear/pear/pear install Math_BigInteger
# cp -R /usr/share/pear/Math/ /usr/share/psa-pear/pear/php/
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