I am using the latest February 11th build from GitHub both the Blender Addon and LuxCore Stand-alone.
root@hp-laptop:/home/mats/LuxCore# locale
LANG=en_US
LC_CTYPE="en_US"
LC_NUMERIC="en_US"
LC_TIME="en_US"
LC_COLLATE=C
LC_MONETARY="en_US"
LC_MESSAGES="en_US"
LC_PAPER="en_US"
LC_NAME="en_US"
LC_ADDRESS="en_US"
LC_TELEPHONE="en_US"
LC_MEASUREMENT="en_US"
LC_IDENTIFICATION="en_US"
LC_ALL=
root@hp-laptop:/home/mats/LuxCore# export LC_ALL=en_US
root@hp-laptop:/home/mats/LuxCore# ./luxcoreui &
[1] 25358
root@hp-laptop:/home/mats/LuxCore# LuxCoreUI v2.5beta1 (LuxCore demo: http://www.luxcorerender.org)
[LuxCore][35.295] Configuration:
[LuxCore][35.310] film.width = "640"
[LuxCore][35.310] film.height = "480"
[LuxCore][35.310] batch.halttime = "0"
[LuxCore][35.311] scene.file = "scenes/classroom/classroom.scn"
[LuxCore][35.311] opencl.cpu.use = "1"
[LuxCore][35.311] opencl.gpu.use = "1"
[LuxCore][35.311] opencl.gpu.workgroup.size = "64"
[LuxCore][35.311] screen.refresh.interval = "100"
[LuxCore][35.311] path.maxdepth = "8"
[LuxCore][35.311] path.russianroulette.depth = "4"
[LuxCore][35.311] tile.multipass.enable = "1"
[LuxCore][35.311] tile.multipass.convergencetest.threshold = "0.02"
[LuxCore][35.312] biaspath.sampling.aa.size = "3"
[LuxCore][35.312] biaspath.sampling.diffuse.size = "3"
[LuxCore][35.312] biaspath.sampling.glossy.size = "2"
[LuxCore][35.312] biaspath.sampling.specular.size = "2"
[LuxCore][35.312] biaspath.sampling.directlight.size = "3"
[LuxCore][35.312] biaspath.pathdepth.diffuse = "3"
[LuxCore][35.312] biaspath.pathdepth.glossy = "1"
[LuxCore][35.312] biaspath.pathdepth.specular = "4"
[LuxCore][35.312] File Name Resolver Configuration:
[LuxCore][35.313] .
[LuxCore][35.313] /home/mats/Programming/LuxCore/scenes/classroom
[SDL][35.313] Reading scene: ./classroom.scn
[SDL][35.313] Define ImageMap: NamedObject
[SDL][35.313] Material definition: chrome
[SDL][35.314] Material definition: lampshades
[SDL][35.339] Material definition: lights
[SDL][35.339] Material definition: desktop
[SDL][35.340] Material definition: floor
[SDL][35.340] Material definition: chair
[SDL][35.340] Material definition: chalkboard
[SDL][35.340] Material definition: rubber
[SDL][35.340] Material definition: walls
[SDL][35.340] Material definition: white_paint
[SDL][35.340] Material definition: white_plastic
[SDL][35.340] Material definition: portal
[SDL][35.340] WARNING: deprecated property scene.camera.lookat
[SDL][35.340] Camera type: perspective
[SDL][35.340] Camera position: Point[-6.07891, 0.763888, -0.244332]
[SDL][35.340] Camera target: Point[3.86243, -0.287569, -0.49751]
[SDL][35.340] Camera clipping plane disabled
RPly: Unable to open file
RenderConfig loading error:
Unable to read PLY mesh file 'scenes/classroom/chair.ply'
Done.