[Mono-list] Exception at Regex.Match (string input, Int32 startat)

[Dimitar Dobrev]

I am trying to run  http://www.open-dent.com OpenDental  6.4 from 
http://www.open-dent.com/manual/developers.html source . It builds
successfully, however, at startup I receive the following exception:

Unhandled Exception: System.NullReferenceException: Object reference not set
to an instance of an object
  at System.Text.RegularExpressions.Regex.Match (System.String input, Int32
startat) [0x00000] in
/home/dimitar/Programs/mono-2.2/mcs/class/System/Assembly/AssemblyInfo.cs:1 
  at System.Text.RegularExpressions.Regex.IsMatch (System.String input,
Int32 startat) [0x00000] in
/home/dimitar/Programs/mono-2.2/mcs/class/System/System.Text.RegularExpressions/Regex.cs:332 
  at System.Text.RegularExpressions.Regex.IsMatch (System.String input)
[0x00000] in
/home/dimitar/Programs/mono-2.2/mcs/class/System/System.Text.RegularExpressions/Regex.cs:327 
  at System.Text.RegularExpressions.Regex.IsMatch (System.String input,
System.String pattern, RegexOptions options) [0x00008] in
/home/dimitar/Programs/mono-2.2/mcs/class/System/System.Text.RegularExpressions/Regex.cs:119 
  at System.Text.RegularExpressions.Regex.IsMatch (System.String input,
System.String pattern) [0x00000] in
/home/dimitar/Programs/mono-2.2/mcs/class/System/System.Text.RegularExpressions/Regex.cs:113 
  at CodeBase.ODEnvironment.Is64BitOperatingSystem () [0x00000] 
  at OpenDental.ContrDocs..ctor () [0x00000] 
  at (wrapper remoting-invoke-with-check) OpenDental.ContrDocs:.ctor ()
  at OpenDental.FormOpenDental.InitializeComponent () [0x00000] 
  at OpenDental.FormOpenDental..ctor () [0x00000] 
  at (wrapper remoting-invoke-with-check) OpenDental.FormOpenDental:.ctor ()
  at OpenDental.FormOpenDental.Main () [0x00000] 

On Windows the program builds, runs and works fine.

Linux: Ubuntu 8.10
Mono: 2.2
Windows: XP SP3
.NET: 3.5 SP1
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