I have copied blockcache module to /modules/ folder and enabled it in site. Then in site configuration, i have enabled the block cache module. I am able to get cached version of blocks in my list. But then on i couldnt able to access my blocks page. it shows the below errors,

[Tue Dec 23 11:56:15 2008] [error] [client 59.183.5.169] PHP Warning: unserialize() [function.unserialize]: Node no longer exists in /ncludes/bootstrap.inc on line 385

could you please let me know how can i avoid this?