Internal Server Error

Exception:

Decoding failed: Syntax error
/home/hildebrc/www/ini-research/sitecake/2.0.3/server/vendor/zendframework/zend-json/Zend/Json/Json.php(71):
#0 /home/hildebrc/www/ini-research/sitecake/2.0.3/server/application/sitecake/meta.php(22): Zend\Json\Json::decode('}', 1)
#1 /home/hildebrc/www/ini-research/sitecake/2.0.3/server/application/sitecake/meta.php(13): sitecake\meta::load()
#2 /home/hildebrc/www/ini-research/sitecake/2.0.3/server/application/sitecake/meta.php(84): sitecake\meta::data()
#3 /home/hildebrc/www/ini-research/sitecake/2.0.3/server/application/sitecake/renderer.php(261): sitecake\meta::ids()
#4 /home/hildebrc/www/ini-research/sitecake/2.0.3/server/application/sitecake/renderer.php(14): sitecake\renderer::purge()
#5 /home/hildebrc/www/ini-research/sitecake/2.0.3/server/admin-full.php(6): sitecake\renderer::process()
#6 /home/hildebrc/www/ini-research/sitecake/2.0.3/server/admin.php(9): include('/home/hildebrc/...')
#7 /home/hildebrc/www/ini-research/sc-admin.php(1): include('/home/hildebrc/...')
#8 {main}