How can i fix Mac verifying problem

I am unable to fix this issue even after the update of MacOS and all, Still did not find any issue regarding this and i am using this Macbook pro since long time and its my first experience that i am having this problem. Would anyone like to give me solution

 

Hello, could you provide us with a bit more details about the issue please? Screenshots of he error/warning message (if any) will be very appreciated.