Xibo has stopped working

Hi,
I am using 1.7rc1 server and client. My client gave error Xibo has stopped working, if you press ok, it close and open zibo client and everything works fine for a while.

I read the event log and see some events reletad.
1. Faulting application name: XiboClient.exe, version: 2.0.0.0, time stamp: 0x54afc6f2
Faulting module name: KERNELBASE.dll, version: 6.3.9600.17278, time stamp: 0x53eeb4c3

2. Application: XiboClient.exe
Framework Version: v4.0.30319
Description: The process was terminated due to an unhandled exception.
Exception Info: System.IO.FileNotFoundException

3.Fault bucket 94666610795, type 5
Event Name: CLR20r3
Response: Not available
Cab Id: 0

Problem signature:
P1: XiboClient.exe
P2: 2.0.0.0
P3: 54afc6f2
P4: mscorlib
P5: 4.0.30319.34014
P6: 52e0b679
P7: 451e
P8: ce
P9: System.IO.FileNotFoundException
P10:

Attached files:
C:\YdsFiles2\19.mp4
C:\Users\l\AppData\Local\Temp\WER93EE.tmp.WERInternalMetadata.xml

Thank you..