Exception: String could not be parsed as XML

    in /var/www/html/martini-git/src/core/GeoInformationService/nhs/nhs.php at line 255

#0 /var/www/html/martini-git/src/core/GeoInformationService/nhs/nhs.php(255): SimpleXMLElement->__construct('')
#1 /var/www/html/martini-git/src/core/GeoInformationService/NhsServices.php(49): NhsServices::findNearestOrganisation('NW4 4XN', 'services/types/...', Object(Martini))
#2 /var/www/html/martini-git/src/core/GeoInformationService/NhsServices.php(73): NhsInformationService->getList(Object(Location))
#3 /var/www/html/martini-git/src/modules/LocalInfoModule.php(1020): NhsInformationService->getHtmlList(Object(Location))
#4 /var/www/html/martini-git/src/modules/LocalInfoModule.php(107): LocalInfoModule->handleListRequest(Array)
#5 /var/www/html/martini-git/src/web.php(358): LocalInfoModule->handleDisplayRequest(Object(HttpRequest))
#6 /var/www/html/martini-git/src/web.php(54): RequestHandler->handleRequestInternal(Object(HttpRequest))
#7 /var/www/html/martini-git/lib/http.php(88): RequestHandler->handleRequest(Object(HttpRequest))
#8 /var/www/html/martini-git/htdocs/index.php(147): HttpApplication->run()
#9 {main}