You get a 500 error when you try to access your course from the Instructor Center.
Cause
The course is past the end date.
Temporarily extend the course end date
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In the Instructor Center, locate your course and click View Sections.
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Click .
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Set the course end date to the current date.
While the course date is extended, students enrolled in the course can access it.
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After viewing your course, be sure to reset the course end date so students cannot
access the expired course.