Unserialize(): Error at offset 0 of 126921 bytes

Using Neos & Flow
1

I sometimes got this error while running some command. It is in Neos 3.1

Notice: unserialize(): Error at offset 0 of 126921 bytes in /Users/nguonchhay/projects/neos/local.wedding-celebration.host/Packages/Libraries/neos/cache/Classes/Frontend/VariableFrontend.php line 91

Type: Neos\Flow\Error\Exception
Code: 1
File: Packages/Framework/Neos.Flow/Classes/Error/ErrorHandler.php
Line: 81

Open Data/Logs/Exceptions/20170617101555baad7a.txt for a full stack trace.

I try to update composer version, clear all caches but still got this problem. Any problem with Neos 3.1?

2

Did you update your PHP, this kind of error can happens when the default serializer change (from unserialize, php core, to igbinary unserialize, by example)

3

My PHP version is 7.0.12

PHP 7.0.12 (cli) (built: Nov 1 2016 10:21:11) ( NTS )
Copyright © 1997-2016 The PHP Group
Zend Engine v3.0.0, Copyright © 1998-2016 Zend Technologies
with Zend OPcache v7.0.12, Copyright © 1999-2016, by Zend Technologies
with Xdebug v2.4.1, Copyright © 2002-2016, by Derick Rethans

It is okay for Neos 3.0.