Orchard CMS Error “ValueFactory attempted to access the Value property of this instance”?

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I I am using orchard 1.8.1 and try to install the theme Bootstrap and it gives me the following error. Can any one help me please?

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.InvalidOperationException: ValueFactory attempted to access the Value property of this instance.

C#

Line 61:         // Load the log4net thread with additional properties if they are available
Line 62:         protected internal void AddExtendedThreadInfo() {
Line 63:             if (_shellSettings.Value != null) {
Line 64:                 ThreadContext.Properties["Tenant"] = _shellSettings.Value.Name;
Line 65:             }

Posted 20-Jan-15 19:55pm

Er. Puneet Goel

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Er. Puneet Goel 21-Jan-15 2:22am

Let me know in case you need futher detials on the error in any move to get it solved.
Thanks

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Er. Puneet Goel · Accepted Answer · 2015-01-20T22:41:00

Solution : Finally after lots of search and tries, just found that it seems to work if, in OrchardLog4netLogger.cs, we replace

C#

_shellSettings = new Lazy<shellsettings>(LoadSettings);</shellsettings>

With

C#

_shellSettings = new Lazy<shellsettings>(LoadSettings,
     System.Threading.LazyThreadSafetyMode.PublicationOnly);</shellsettings>

Then, all threads are allowed to run the initialization method. The first thread to complete initialization sets the value of the Lazy<t> instance.