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ReddyReddy 

Unknown property 'String.lastname'

Unknown property 'String.lastname'.
how to using this pgination
SandhyaSandhya (Salesforce Developers) 
Hi,

This error refers that property in your controller is a string rather than an sobject instance.

please refer below linlks to get more information on this.

http://salesforce.stackexchange.com/questions/8318/unknown-property-string-plancount-visual-force
 
http://stackoverflow.com/questions/35177469/salesforce-unknown-property-string-name

Hope this helps you!

Please mark it as Best Answer if my reply was helpful. It will make it available for other as the proper solution.
 
Thanks and Regards
Sandhya