This error message may be displayed when opening a document, and affects all QlikView version from 11.20 to 12.10.
Clients affected: Ajax / Full Browser Client and Internet Explorer Plugin.
Examples of messages
QlikView 11.20 and Firefox / Full Browser Client
QlikView 12.10 and Full Browser Client
Internet Explorer plugin, version independant
Reviewing the QlikView Server Event logs
Logged at verbosity HIGH
, the log files will show the following: The document XXXX.qvw failed to load because document not in document list. 
This occurs when using a QlikView Extranet license, or having a limitation in the License Enabler File (LEF) similar to the example below. This restriction sets the number of documents that can be displayed in the Access Point.
Verify if you have a limitation in the license avoiding to open more than a defined number of documents :NUMBER_OF_DOCUMENTS;2;;
So the first 2 opened documents will be assigned. It's not possible to open more than those 2 documents in this example.
More information on this functionality, and how to resolve a faulty assignments, review:Documents do not appear on the Access Point or cannot be opened when using an Extranet Server LicenseQlikView Server does not allow all documents to be loaded