Question: Maple 14 is fine, Maple 15 lost kernel connection

This worksheet is created with Maple 14, which works fine. Running it in Maple 15 I got a message "Connection to kernel is lost" or something the like (the message was in Chinese). I am under Mac OSX and the worksheet makes use of the grtensor ii package freely available on the net.  Any assist please?

C-metric-4d.mwC-metric-4d.mw cmetric-ansatz-4.mpl

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