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Sitecore error “Server cannot modify cookies after HTTP headers have been sent.”

I am trying to Insert a new form. When I am trying to select a placeholder for the form, following error is showing :
 
when I had installed the WFFM, I went to "Restrict placeholder" and added my placeholder, like below

 
 I installed WFFM first in my sitecore instance, and then I installed SXA. During SXA installation, a popup came :
 

and I chose "Merge" option and clicked "Apply to all". After installation, when In add form, it show the error during selection of placeholder. If I choose Overwrite option, SXA will not install.

Any suggestion what to do?

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