(debian) installing mod_qos on apache results in error on start

I installed the mod_qos module using the steps found here , every step went perfectly fine without any problems, however, when attempting to restart the apache service it returned the following error: apache2: Syntax error on line 203 of /etc/apache2/apache2.conf: Syntax error on line 1 of /etc/apache2/mods-enabled/qos.load: Cannot load /usr/lib/apache2/modules/mod_qos.so into server: /usr/lib/apache2/modules/mod_qos.so: undefined symbol: EVP_DecryptFinal The contents of the qos.load file is just this line: LoadModule qos_module /usr/lib/apache2/modules/mod_qos.so How do I solve this error?