Nagvis hover_url

Hallo,
ich möchte gerne in einer Nagvis Map beim drauf fahren mit dem mauszeiger auf ein Bild von einem anderen Webserver verweisen. Wenn ich unter Aktionen hover_url_ , url, dely, , Target alles einegeben habe, bekomme ich folgende Fehlermeldung:
Error (Error): Call to undefined function mb_convert_encoding()array(1) { [0]=> array(2) { [“function”]=> string(15) “nagvisException” [“args”]=> array(1) { [0]=> object(Error)#20 (7) { [“message”:protected]=> string(48) “Call to undefined function mb_convert_encoding()” [“string”:“Error”:private]=> string(0) “” [“code”:protected]=> int(0) [“file”:protected]=> string(85) “/omd/versions/2.1.0p12.cee/share/nagvis/htdocs/server/core/classes/NagVisHoverUrl.php” [“line”:protected]=> int(98) [“trace”:“Error”:private]=> array(5) { [0]=> array(6) { [“file”]=> string(85) “/omd/versions/2.1.0p12.cee/share/nagvis/htdocs/server/core/classes/NagVisHoverUrl.php” [“line”]=> int(46) [“function”]=> string(12) “readHoverUrl” [“class”]=> string(14) “NagVisHoverUrl” [“type”]=> string(2) “->” [“args”]=> array(0) { } } [1]=> array(6) { [“file”]=> string(85) “/omd/versions/2.1.0p12.cee/share/nagvis/htdocs/server/core/classes/CoreModGeneral.php” [“line”]=> int(88) [“function”]=> string(11) “__construct” [“class”]=> string(14) “NagVisHoverUrl” [“type”]=> string(2) “->” [“args”]=> array(2) { [0]=> object(GlobalCore)#1 (4) { [“iconsetTypeCache”:protected]=> array(0) { } [“selectable_sources”:protected]=> array(0) { } [“statelessObjectTypes”]=> array(4) { [“textbox”]=> bool(true) [“shape”]=> bool(true) [“line”]=> bool(true) [“container”]=> bool(true) } [“demoMaps”]=> array(7) { [0]=> string(12) “demo-germany” [1]=> string(14) “demo-ham-racks” [2]=> string(9) “demo-load” [3]=> string(13) “demo-muc-srv1” [4]=> string(13) “demo-overview” [5]=> string(11) “demo-geomap” [6]=> string(12) “demo-automap” } } [1]=> string(53) “http://hierstehtderweblink.jpeg” } } [2]=> array(6) { [“file”]=> string(85) “/omd/versions/2.1.0p12.cee/share/nagvis/htdocs/server/core/classes/CoreModGeneral.php” [“line”]=> int(53) [“function”]=> string(11) “getHoverUrl” [“class”]=> string(14) “CoreModGeneral” [“type”]=> string(2) “->” [“args”]=> array(0) { } } [3]=> array(6) { [“file”]=> string(78) “/omd/versions/2.1.0p12.cee/share/nagvis/htdocs/server/core/functions/index.php” [“line”]=> int(120) [“function”]=> string(12) “handleAction” [“class”]=> string(14) “CoreModGeneral” [“type”]=> string(2) “->” [“args”]=> array(0) { } } [4]=> array(4) { [“file”]=> string(75) “/omd/versions/2.1.0p12.cee/share/nagvis/htdocs/server/core/ajax_handler.php” [“line”]=> int(59) [“args”]=> array(1) { [0]=> string(78) “/omd/versions/2.1.0p12.cee/share/nagvis/htdocs/server/core/functions/index.php” } [“function”]=> string(7) “require” } } [“previous”:“Error”:private]=> NULL } } } }

Damit kann ich leider überhaupt nichts anfangen. Jemand eine Idee ?