About all I can offer is to review the Help on things, as one thing I noticed is it appears you should be using hours instead of hour, but the message seems to be indicating a syntax related issue here, but I am not sure what it may be with just the error, would need script snippet to be able to tell for sure I believe.
http://help.qlik.com/en-US/qlikview/12.1/Subsystems/Client/Content/Scripting/ScriptPrefixes/Buffer.h...
Regards,
Brett
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