NullReferenceException when downloading episodes

Help & Support
1

I noticed this before for a series called Jinsei but I figured there was something wrong with the mapping and ignored it, but just now it happened again with an American series called Believe. S01E13 would not download automatically, and upon doing it manually I got “[POST] Internal Server Error : /api/release”. The logs say this:

14-7-10 14:12:31.7|Fatal|NzbDroneErrorPipeline|Request Failed
System.NullReferenceException: Object reference not set to an instance of an object
at System.ComponentModel.ReflectionPropertyDescriptor.SetValue (System.Object component, System.Object value) [0x00000] in :0

Sadly I can’t run Drone in debug mode because of my setup so I can’t give you a proper error description. The release name of the episode that fails is “Believe.S01E13.720p.HDTV.x264-SKGTV”. I’m on the latest version of the development branch.

2

Can you not edit the script that launches drone and insert --debug before the exe path?

As-is there isn’t anything I can do because I have no idea where/why it happened.

3

It took a while but I think I managed. Is this what you need?

14-7-10 17:54:29.4|Fatal|NzbDroneErrorPipeline|Request Failed
System.NullReferenceException: Object reference not set to an instance of an object
at System.ComponentModel.ReflectionPropertyDescriptor.SetValue (System.Object component, System.Object value) [0x00038] in /root/spksrc/native/mono/work-native/mono-3.4.0/mcs/class/System/System.ComponentModel/ReflectionPropertyDescriptor.cs:272

For my own reference (or for anyone else who wants to run Drone in debug mode on a Synology NAS):

Edit /var/packages/nzbdrone/scripts/start-stop-status. Then change the following line…

COMMAND="env PATH=${MONO_PATH}:${PATH} LD_LIBRARY_PATH=${INSTALL_DIR}/lib ${MONO} ${NZBDRONE}"

…into…

COMMAND="env PATH=${MONO_PATH}:${PATH} LD_LIBRARY_PATH=${INSTALL_DIR}/lib ${MONO}"

…and change the following line…

start-stop-daemon -S -q -b -N 10 -x ${COMMAND} -c ${USER} > /dev/null

…into…

start-stop-daemon -S -q -b -N 10 -x ${COMMAND} -c ${USER} -- --debug ${NZBDRONE} > /dev/null

4

Ahhh, I’ve seen this before, pushed a fix that should address it, thanks for getting the additional info.

I’ve talked to the package creator and he’s going to look at always running mono in debug, it makes a huge difference most of the time and there isn’t a reason not to (a small perf hit is worth it).

5

I agree, I’m just going to keep running it like this. Even in debug mode Drone is lightning fast, especially compared to Sickbeard. And most people switching to Drone will be used to SB being slow.

Thanks for the fix. I’d like to confirm that this solved the problem. The episode was just downloaded without a hitch.