Well, bt started working, i opened the device manager, scanned for my cell phone, tried to pair with it, but all the sudden it crashed, now every time i try to open the device manager i get that reported error, even after reboot, etc:

$ kbluetooth4                                                               
kbluetooth4(7429) Solid::Control::ManagerBasePrivate::loadBackend: Backend loaded:  "BlueZ"                 
kbluetooth4(7429) KBlueTray::onlineMode: online Mode                                                        
kbluetooth4(7429) KBlueTray::onlineMode: adapter size  1                                                    
kbluetooth4(7429) KBlueTray::onlineMode: Adapter found  "jenny"                                           
AGENT registered !                                                                                          
kbluetooth4(7429) ObexServer::ObexServer: "00:00:00:00:00:00"                                               
kbluetooth4(7429) ObexServer::serverCreated: obex server created                                            
kbluetooth4(7429) ObexServer::serverCreated: session interface created for:  "/org/openobex/server1"        
kbluetooth4(7429) ObexServer::slotStarted: server started                 
kbluetooth4(7429) KBlueTray::slotServerStarted: obex server started                                         
kbluetooth4(7429) KBlueTray::showManager: Starting Device Manager                                           
kbluetooth4-devicemanager(7432) Solid::Control::ManagerBasePrivate::loadBackend: Backend loaded:  "BlueZ"   
kbluetooth4-devicemanager(7432) DeviceMan::DeviceMan: Device Manager - Welcome                              
QDBusObjectPath: invalid path ""                                                                            
process 7432: arguments to dbus_message_new_method_call() were incorrect, assertion "path != NULL" failed in file dbus-message.c line 1070.
This is normally a bug in some application using the D-Bus library.                                                                        
QDBusConnection: error: could not send message to service "org.bluez" path "" interface "org.freedesktop.DBus.Introspectable" member "Introspect"
Object::connect: No such signal Solid::Control::BluetoothRemoteDevice::nodeCreated(QString)                                                      
Object::connect: No such signal Solid::Control::BluetoothRemoteDevice::nodeRemoved(QString)                                                      
Object::connect: No such signal Solid::Control::BluetoothRemoteDevice::nodeCreated(QString)                                                      
Object::connect: No such signal Solid::Control::BluetoothRemoteDevice::nodeRemoved(QString)                                                      
Object::connect: No such signal Solid::Control::BluetoothRemoteDevice::nodeCreated(QString)                                                      
Object::connect: No such signal Solid::Control::BluetoothRemoteDevice::nodeRemoved(QString)                                                      
kbluetooth4-devicemanager(7432) DeviceMan::getConfiguredDevices: Device List Size:  1                                                            
kbluetooth4-devicemanager: symbol lookup error: kbluetooth4-devicemanager: undefined symbol: _ZN5Solid7Control21BluetoothRemoteDevice4nameEv