BESx - application error in event viewer

Hi All,
Running Server 2012r2 with BESx 5.0.4 - im get error below in event viewer - any ideas how to fix this please?

Faulting application name: CalHelperWS.exe, version:, time stamp: 0x512fc294
Faulting module name: KERNELBASE.dll, version: 6.3.9600.17736, time stamp: 0x550f42c2
Exception code: 0xc0000142
Fault offset: 0x0009d4f2
Faulting process id: 0x35ec
Faulting application start time: 0x01d0a8f06dd065b6
Faulting application path: C:\Program Files (x86)\Research In Motion\BlackBerry Enterprise Server\CalHelperWS.exe
Faulting module path: KERNELBASE.dll
Report Id: ab88dd66-14e3-11e5-8102-38eaa7a0e1dd
Faulting package full name:
Faulting package-relative application ID:
jag bAsked:
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Does the application work?
jag bAuthor Commented:
Yes mate - I can log Into the BES but concerned about the error.  I haven't tried to activate a new BB
Error means that some DLL is missing.
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jag bAuthor Commented:
Any idea where I can get this?? Would it be ok to get from pervious backup and copy into correct location ?
Run dependency walker from or download windows SDK which includes same.
Then look if application does not load 2 versions of same DLL
Failing that registry might be corrupt - start with trying as new clean user, etc

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jag bAuthor Commented:
hi gheist - shall i restore another dll from backup first?
You have to figure it out using dependency walker and process explorer. I do not have BES
jag bAuthor Commented:
no problem mate - thanks for your help
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