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Run phpinfo() to display your PHP configuration details.
Scroll down to near the bottom, and check the value of session.save_path in the session section.
Is there a value?
If so, does that folder actually exist?
If no value is displayed, edit php.ini to set a value for session.save_path.
A simple option is to use the Windows Temp folder: session.save_path = ‘C:\WINDOWS\Temp’