CLR error

[Grunt]

I started Plan-G, loaded an FS9 plan and got an error (see below).  All waypoints and airports exist in FS9.  Now Plan-G won't run.  It opens, gives me a map, then gives me an error (see way below)

Description:
  Stopped working

Problem signature:
  Problem Event Name:   CLR20r3
  Problem Signature 01:   plan-g.exe
  Problem Signature 02:   0.8.0.380
  Problem Signature 03:   4ae4b5c8
  Problem Signature 04:   mscorlib
  Problem Signature 05:   2.0.0.0
  Problem Signature 06:   4a275af7
  Problem Signature 07:   344b
  Problem Signature 08:   119
  Problem Signature 09:   System.IO.DirectoryNotFound
  OS Version:   6.1.7600.2.0.0.256.48
  Locale ID:   1033

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Error I get now:

Problem signature:
  Problem Event Name:   BEX
  Application Name:   Plan-G.exe
  Application Version:   0.8.0.380
  Application Timestamp:   4ae4b5c8
  Fault Module Name:   nvSCPAPI.dll_unloaded
  Fault Module Version:   0.0.0.0
  Fault Module Timestamp:   4abff864
  Exception Offset:   13645c97
  Exception Code:   c0000005
  Exception Data:   00000008
  OS Version:   6.1.7600.2.0.0.256.48
  Locale ID:   1033
  Additional Information 1:   0577
  Additional Information 2:   05772e279a56051761c3647fecc87ac9
  Additional Information 3:   75fc
  Additional Information 4:   75fcd0646007b66df5ed3156acaec74c

Read our privacy statement online:
  http://go.microsoft.com/fwlink/?linkid=104288&clcid=0x0409

If the online privacy statement is not available, please read our privacy statement offline:
  C:\Windows\system32\en-US\erofflps.txt

[tim arnot]

Can you show me the log file?
Thanks.

[Grunt]

Can you show me the log file?
Thanks.

Sorry - forgot that.  Here it is.

[tim arnot]

Thanks. You are opening a flight plan from the Recent Files list that has been either moved or deleted. I'll fix the error in the next build.

[Grunt]

Thanks. You are opening a flight plan from the Recent Files list that has been either moved or deleted. I'll fix the error in the next build.

Strange.  I'll check but I thought the file existed.  What causes Plan-G to keep giving errors after the first time when yoiu open it again and don't try and open that file.