SCORM courses hold data about a user's progression. When a SCORM course loads, it validates this data against the imsmanifest.xml file. If the data does not match it causes an error. For example, if you originally had 14 slides in a SCORM course and you remove 1 slide, the data will no longer match, as the expectation is, there are 14 slides in the SCORM course.
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