Event Type: CLR20r3 Signature Problem: P4:mscorlib.dll P9:System.FormatException

Hello, I'm working on a C#.net app.
This is a machine interfacing software , where we use it to control the machine by interacting with it through hardware.
The software works fine on all the machines that we have in our company, but fails to open on client's machine.We have Windows XP, Windows 7 (32-bit as well as 64-bit) and the s/w just works smoothly with all of them.
Tried checking event log and found this:
Log Name: Application
Source : Windows Error Reporting
Date: 30/10/2014 3:07:59 p.m.
Event ID : 1001
Task Category : None
Level : Information
Keywords: Classic
User: N / A
Computer: Pro01PC14101401
Description:
Container 123123135 error type 22
Event Name : Event clr20r3 by Name: clr20r3
Answer: Not available Answer : Not available
CAB ID : 0

Signature of the problem:
P1: vms.exe
P2: 1.2.0.2
P3: 5413cdea
P4: mscorlib
P5: 2.0.0.0
P6: 53a12268
P7: c44
P8: 59
P9 : System.FormatException
P10 :

Attachments:
C: \ Users \ PRO01 \ AppData \ Local \ Temp \ WERB9F0.tmp.WERInternalMetadata.xml

These files may be available here:
C:\Users\Pro01\AppData\Local\Microsoft\Windows\WER\ReportArchive\AppCrash_vms.exe_94a436e347f991c21f9b4ed832169b677b88870_0e18144f

Analysis symbol :
New search solution : 0
Report ID : 18edc5d1-603e - 11e4-90e2-74d435f64282
Report Status : 0
PLEASE NOTE: THE OS is WINDOWS 7 and  IS IN FRENCH LANGUAGE AT CLIENT'S MACHINE WHEREAS WE ARE USING ENGLISH VERSION IN OUR COMPANY. Will it create any problems OR can it be something else?
Please Help.