My guess is that you have several master objects around.
For starters I think it's best to find out if that's the case.
Apparently:
#### /usr/lib/pike7.8/modules/Locale.pmod/module.pmod: Failed to find name of unencodable object master()[1]. /usr/lib/pike7.8/master.pike:5170: master()[2]->Encoder()->nameof(master()[1],({0})) /usr/lib/pike7.8/master.pike:5201: master()[2]->Encoder()->nameof(master()[1].joinnode,UNDEFINED) /usr/lib/pike7.8/modules/Tools.pmod/Standalone.pmod/dump.pike:220: /main()->dumpit("/usr/lib/pike7.8/modules/Locale.pmod/module.pmod","/usr/lib/pike7.8/modules/Locale.pmod/module.pmod") /usr/lib/pike7.8/modules/Tools.pmod/Standalone.pmod/dump.pike:183: /main()->dumpit("/usr/lib/pike7.8/modules/Locale.pmod","/usr/lib/pike7.8/modules/Locale.pmod") /usr/lib/pike7.8/modules/Tools.pmod/Standalone.pmod/dump.pike:183: /main()->dumpit("/usr/lib/pike7.8/modules","/usr/lib/pike7.8/modules") /usr/lib/pike7.8/modules/Tools.pmod/Standalone.pmod/dump.pike:341: /main()->dump_files()