Cause:
If you are passing SPWeb object in the thread method, you will get this exception.Suppose in the main thread , you have created the SPWeb object and pass this object to a thread method, like this,
using (SPSite site = new SPSite(SPContext.Current.Site.Url))
{
using (SPWeb web = site.OpenWeb())
{
activateThread = new Thread(delegate()
{
this.Activate(web);
});
activateThread.Start();
}
}
Here the SPWeb object 'web' is passing to the thread method 'Activate'. The issue is because of this only.
Remedy:
Don't pass the SPWeb object from main thread (Application Thread) to a thread method. Instead create the SPWeb object inside the thread method (Here Activate method) and dispose the web object there.
