When RT rendering in VRay, the process stuck in the middle of globle light manager.
Following lines appear in the VRay progress window.

Preparing renderer...
Preparing scene for rendering...
[RenderView] startCameraTime=0.000000, endCameraTime=0.033333
[RenderView] numCameraTMs=2, numFrames=1, frameSamples=2
Initializing built-in VFB.
[RenderView] startCameraTime=0.000000, endCameraTime=0.033333
[RenderView] numCameraTMs=2, numFrames=1, frameSamples=2
Starting DR 1
dr host: 127.0.0.1:20211
Connected to render host 127.0.0.1:20211
Using 1 hosts for distributed rendering.
Preparing camera sampler.
Preparing scene for frame...
Compiling geometry...
Preparing ray server.
Creating and initializing 8 thread(s).
Allocating memory for build data of 37442 faces (149768 bytes, 0.1 MB).
Initializing face build data.
Creating 'done' event.
Starting first thread.
Waiting for thread completion.
Releasing thread resources.
SDTree statistics:
Total number of faces stored: 37442
Max tree depth: 37
Average tree depth: 21.5812
Number of tree nodes: 28897
Number of tree faces: 171932
Number of tree leafs: 12831
Average faces/leaf: 13.3997
Memory usage: 2.95 MB
Scene bounding box is [11787.8,1366.62,2.66611]-[14058.1,2561.87,397.646]
Preparing direct light manager.
Preparing global light manager.
Running RTEngine
Setting up 1 thread(s)

Please somebody give me a solution for this issue.