A PHP error was encountered

Message:

Uncaught Error: Call to undefined function json_decode() in /home/re4x6de3984re/public_html/system/libraries/codebreeder/cache/file.php:57
Stack trace:
#0 /home/re4x6de3984re/public_html/system/libraries/codebreeder/cache.php(34): CodeBreeder_Cache_File->_get('core_config_fe_...', true)
#1 /home/re4x6de3984re/public_html/application/libraries/bootstrap.php(54): CodeBreeder_Cache->item('core_config_fe', true)
#2 /home/re4x6de3984re/public_html/application/libraries/bootstrap.php(19): Bootstrap->getCache()
#3 /home/re4x6de3984re/public_html/application/libraries/bootstrap.php(11): Bootstrap->initialize(Array)
#4 /home/re4x6de3984re/public_html/system/core/codebreeder/loader.php(367): Bootstrap->__construct(Array)
#5 /home/re4x6de3984re/public_html/system/core/codebreeder/loader.php(137): CodeBreeder_Loader::instantiate('bootstrap', '', Array)
#6 /home/re4x6de3984re/public_html/system/core/codebreeder/codebreeder.php(240): CodeBreeder_Loader::library('bootstrap', Array, true)
#7 /home/re4x6de3984re/public_html/s

Location:

/home/re4x6de3984re/public_html/system/libraries/codebreeder/cache/file.php on line 57