Error message

• Warning: array_flip(): Can only flip STRING and INTEGER values! in DrupalDefaultEntityController->load() (line 175 of /var/www/vhosts/postwave.gr/httpdocs/includes/entity.inc).
• Warning: array_flip(): Can only flip STRING and INTEGER values! in DrupalDefaultEntityController->cacheGet() (line 391 of /var/www/vhosts/postwave.gr/httpdocs/includes/entity.inc).
• Notice: Trying to get property 'type' of non-object in eval() (line 13 of /var/www/vhosts/postwave.gr/httpdocs/modules/php/php.module(80) : eval()'d code).
• Warning: array_flip(): Can only flip STRING and INTEGER values! in DrupalDefaultEntityController->load() (line 175 of /var/www/vhosts/postwave.gr/httpdocs/includes/entity.inc).
• Warning: array_flip(): Can only flip STRING and INTEGER values! in DrupalDefaultEntityController->cacheGet() (line 391 of /var/www/vhosts/postwave.gr/httpdocs/includes/entity.inc).
• Notice: Trying to get property 'type' of non-object in eval() (line 13 of /var/www/vhosts/postwave.gr/httpdocs/modules/php/php.module(80) : eval()'d code).
• Warning: array_flip(): Can only flip STRING and INTEGER values! in DrupalDefaultEntityController->load() (line 175 of /var/www/vhosts/postwave.gr/httpdocs/includes/entity.inc).
• Warning: array_flip(): Can only flip STRING and INTEGER values! in DrupalDefaultEntityController->cacheGet() (line 391 of /var/www/vhosts/postwave.gr/httpdocs/includes/entity.inc).
• Notice: Trying to get property 'type' of non-object in eval() (line 13 of /var/www/vhosts/postwave.gr/httpdocs/modules/php/php.module(80) : eval()'d code).
• Warning: array_flip(): Can only flip STRING and INTEGER values! in DrupalDefaultEntityController->load() (line 175 of /var/www/vhosts/postwave.gr/httpdocs/includes/entity.inc).
• Warning: array_flip(): Can only flip STRING and INTEGER values! in DrupalDefaultEntityController->cacheGet() (line 391 of /var/www/vhosts/postwave.gr/httpdocs/includes/entity.inc).
• Notice: Trying to get property 'type' of non-object in eval() (line 13 of /var/www/vhosts/postwave.gr/httpdocs/modules/php/php.module(80) : eval()'d code).
• Warning: array_flip(): Can only flip STRING and INTEGER values! in DrupalDefaultEntityController->load() (line 175 of /var/www/vhosts/postwave.gr/httpdocs/includes/entity.inc).
• Warning: array_flip(): Can only flip STRING and INTEGER values! in DrupalDefaultEntityController->cacheGet() (line 391 of /var/www/vhosts/postwave.gr/httpdocs/includes/entity.inc).
• Notice: Trying to get property 'type' of non-object in eval() (line 13 of /var/www/vhosts/postwave.gr/httpdocs/modules/php/php.module(80) : eval()'d code).
• Warning: array_flip(): Can only flip STRING and INTEGER values! in DrupalDefaultEntityController->load() (line 175 of /var/www/vhosts/postwave.gr/httpdocs/includes/entity.inc).
• Warning: array_flip(): Can only flip STRING and INTEGER values! in DrupalDefaultEntityController->cacheGet() (line 391 of /var/www/vhosts/postwave.gr/httpdocs/includes/entity.inc).
• Notice: Trying to get property 'type' of non-object in eval() (line 13 of /var/www/vhosts/postwave.gr/httpdocs/modules/php/php.module(80) : eval()'d code).