Error regarding crystal report?

sometime i am getting a error when trying to generate report through crystal report and c#. but this error not occured everytime rather sometime it occured. please tell me anyone why this error occur and how to fix it.

the error is

Error Could not load file or assembly 'CrystalDecisions.CrystalReports.Engine, Version=10.2.3600.0, Culture=neutral, PublicKeyToken=692fbea5521e1304' or one of its dependencies. The system cannot find the file specified.
Error System.IO.FileNotFoundException: Could not load file or assembly 'CrystalDecisions.CrystalReports.Engine, Version=10.2.3600.0, Culture=neutral, PublicKeyToken=692fbea5521e1304' or one of its dependencies. The system cannot find the file specified.
File name: 'CrystalDecisions.CrystalReports.Engine, Version=10.2.3600.0, Culture=neutral, PublicKeyToken=692fbea5521e1304' ---> System.IO.FileNotFoundException: Could not load file or assembly 'CrystalDecisions.CrystalReports.Engine, Version=10.2.3600.0, Culture=neutral, PublicKeyToken=692fbea5521e1304' or one of its dependencies. The system cannot find the file specified.
File name: 'CrystalDecisions.CrystalReports.Engine, Version=10.2.3600.0, Culture=neutral, PublicKeyToken=692fbea5521e1304'

WRN: Assembly binding lo开发者_开发知识库gging is turned OFF.
To enable assembly bind failure logging, set the registry value [HKLM\Software\Microsoft\Fusion!EnableLog] (DWORD) to 1.
Note: There is some performance penalty associated with assembly bind failure logging.
To turn this feature off, remove the registry value [HKLM\Software\Microsoft\Fusion!EnableLog].

   at EOD_Schedular.frmMain.GenerateReport(Boolean ViewOnly)
   at EOD_Schedular.frmMain.Generate(Boolean ViewOnly)


Method Name: GenerateReport
Line: 0
Column: 0
Sql: Not Found

thanks

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Do a google search for the error. There are a lot of references. Most seem to be DLL version issues.