how to get loglik parameter from splm package?

splm package is a r  implemention of spatial panel data models.
and the loglik paremeter is most important infomation for splm methods.
but  i found the loglik always been null ,it's craze to get right estimation 
in splm with null  loglik.
Any one knows the splm package and can get the right loglik ? please help
me.

thanks

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