Our site is constantly throwing an error stating that the string cannot be converted to a date in the schedule purge process. Enclosed is a snippet from the event log...

AssemblyVersion: 5.6.2
PortalID: -1
PortalName:
UserID: -1
UserName:
ActiveTabID: -1
ActiveTabName:
RawURL:
AbsoluteURL:
AbsoluteURLReferrer:
UserAgent:
DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider
ExceptionGUID: ac88b17c-a0b2-4a28-a20c-94b0deac7fe6
InnerException: String was not recognized as a valid DateTime.
FileName:
FileLineNumber: 0
FileColumnNumber: 0
Method: System.DateTimeParse.Parse
StackTrace:
Message: System.FormatException: String was not recognized as a valid DateTime. at System.DateTimeParse.Parse(String s, DateTimeFormatInfo dtfi, DateTimeStyles styles) at DotNetNuke.Services.ModuleCache.FileProvider.IsFileExpired(String file) at DotNetNuke.Services.ModuleCache.FileProvider.PurgeExpiredItems(Int32 portalId) at DotNetNuke.Services.ModuleCache.PurgeModuleCache.DoWork()
Source:
Server Name: DURABLE-DC

It appears that the error is coming from the schedule, which is set to default values, and listed below:

Purge Schedule History                          Every Day
Search Engine Scheuler                         Every 30 minutes
Purge Module Cache                               Every Minute
Messaging Dispatch                               Every Minute

Platform is Windows Server 2008 R2 and SQL 2008 R2...

Any help would greatly be appreciated...