Error when viewing event detail

When opening an event in the backend I receive the following error:

Strict Standards: Declaration of JevDate::toSql() should be compatible with JDate::toSql($local = false, JDatabase $dbo = NULL) in /var/www/vhosts/http://drachtsterboystest1.nl/httpdocs/components/com_jevents/libraries/jevdate.php on line 16 Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 154 bytes) in /var/www/vhosts/http://drachtsterboystest1.nl/httpdocs/libraries/joomla/cache/storage/file.php on line 567

My configuration:

PHP Version : 5.4.45

MySQL Version : 5.5.46-cll-lve

Fix jQuery? : Yes

Load JEvents Bootstrap CSS? : Yes

Load JEvents Bootstrap JS? : Yes

Max Input Vars ? : 10000

Club code set? : No  

Joomla : 2.5.28

component_com_jevents : 3.2.21

component_com_jce : 2.4.5

module_mod_jevents_cal : 3.2.21

module_mod_jevents_custom : 3.2.21

module_mod_jevents_filter : 3.2.21

module_mod_jevents_latest : 3.2.21

module_mod_jevents_legend : 3.2.21

module_mod_jevents_switchview : 3.2.21

plugin_content_jevents : 3.2.21

plugin_finder_jevents : 3.2.21

plugin_search_eventsearch : 3.2.21

What is wrong?