what does this error mean?

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What is this error i found instead of the website loading? can it be exploited?

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Server Error in '/' Application.
The current identity (WIN-4PEER1JJ28I\IWPD_6(website)) does not have write access to 'C:\Inethub\vhosts\website\tmp'.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Web.HttpException: The current identity (WIN-4PEER1JJ28I\IWPD_6(website)) does not have write access