Error message

• Deprecated function: mb_strlen(): Passing null to parameter #1 ($string) of type string is deprecated in drupal_strlen() (line 482 of /srv/data/web/vhosts/desmedt.photos/htdocs/includes/unicode.inc).
• Deprecated function: mb_strlen(): Passing null to parameter #1 ($string) of type string is deprecated in drupal_strlen() (line 482 of /srv/data/web/vhosts/desmedt.photos/htdocs/includes/unicode.inc).
• Deprecated function: unserialize(): Passing null to parameter #1 ($data) of type string is deprecated in simplenews_subscriber_load_multiple() (line 1636 of /srv/data/web/vhosts/desmedt.photos/htdocs/sites/all/modules/simplenews/simplenews.module).
• Deprecated function: mb_strlen(): Passing null to parameter #1 ($string) of type string is deprecated in drupal_strlen() (line 482 of /srv/data/web/vhosts/desmedt.photos/htdocs/includes/unicode.inc).
• Deprecated function: unserialize(): Passing null to parameter #1 ($data) of type string is deprecated in simplenews_subscriber_load_multiple() (line 1636 of /srv/data/web/vhosts/desmedt.photos/htdocs/sites/all/modules/simplenews/simplenews.module).
• Deprecated function: mb_strlen(): Passing null to parameter #1 ($string) of type string is deprecated in drupal_strlen() (line 482 of /srv/data/web/vhosts/desmedt.photos/htdocs/includes/unicode.inc).
• Deprecated function: unserialize(): Passing null to parameter #1 ($data) of type string is deprecated in simplenews_subscriber_load_multiple() (line 1636 of /srv/data/web/vhosts/desmedt.photos/htdocs/sites/all/modules/simplenews/simplenews.module).
• Deprecated function: mb_strlen(): Passing null to parameter #1 ($string) of type string is deprecated in drupal_strlen() (line 482 of /srv/data/web/vhosts/desmedt.photos/htdocs/includes/unicode.inc).
• Deprecated function: mb_strlen(): Passing null to parameter #1 ($string) of type string is deprecated in drupal_strlen() (line 482 of /srv/data/web/vhosts/desmedt.photos/htdocs/includes/unicode.inc).
• Deprecated function: unserialize(): Passing null to parameter #1 ($data) of type string is deprecated in simplenews_subscriber_load_multiple() (line 1636 of /srv/data/web/vhosts/desmedt.photos/htdocs/sites/all/modules/simplenews/simplenews.module).
• Deprecated function: mb_strlen(): Passing null to parameter #1 ($string) of type string is deprecated in drupal_strlen() (line 482 of /srv/data/web/vhosts/desmedt.photos/htdocs/includes/unicode.inc).
• Deprecated function: unserialize(): Passing null to parameter #1 ($data) of type string is deprecated in simplenews_subscriber_load_multiple() (line 1636 of /srv/data/web/vhosts/desmedt.photos/htdocs/sites/all/modules/simplenews/simplenews.module).
• Deprecated function: mb_strlen(): Passing null to parameter #1 ($string) of type string is deprecated in drupal_strlen() (line 482 of /srv/data/web/vhosts/desmedt.photos/htdocs/includes/unicode.inc).
• Deprecated function: unserialize(): Passing null to parameter #1 ($data) of type string is deprecated in simplenews_subscriber_load_multiple() (line 1636 of /srv/data/web/vhosts/desmedt.photos/htdocs/sites/all/modules/simplenews/simplenews.module).
• Deprecated function: mb_strlen(): Passing null to parameter #1 ($string) of type string is deprecated in drupal_strlen() (line 482 of /srv/data/web/vhosts/desmedt.photos/htdocs/includes/unicode.inc).
• Deprecated function: unserialize(): Passing null to parameter #1 ($data) of type string is deprecated in simplenews_subscriber_load_multiple() (line 1636 of /srv/data/web/vhosts/desmedt.photos/htdocs/sites/all/modules/simplenews/simplenews.module).
• Deprecated function: mb_strlen(): Passing null to parameter #1 ($string) of type string is deprecated in drupal_strlen() (line 482 of /srv/data/web/vhosts/desmedt.photos/htdocs/includes/unicode.inc).
• Deprecated function: unserialize(): Passing null to parameter #1 ($data) of type string is deprecated in simplenews_subscriber_load_multiple() (line 1636 of /srv/data/web/vhosts/desmedt.photos/htdocs/sites/all/modules/simplenews/simplenews.module).
• Warning: Cannot modify header information - headers already sent by (output started at /srv/data/web/vhosts/desmedt.photos/htdocs/includes/bootstrap.inc:1692) in drupal_send_headers() (line 1551 of /srv/data/web/vhosts/desmedt.photos/htdocs/includes/bootstrap.inc).
• Error: Call to undefined function each() in SimplenewsSpool->nextSource() (line 273 of /srv/data/web/vhosts/desmedt.photos/htdocs/sites/all/modules/simplenews/includes/simplenews.source.inc).