Failed to Compile

W7, CS6: Trying to convert small test epub file created in InDesign to mobi via Kindle Previewer, I get "failed to compile" with these details:
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Amazon kindlegen(Windows) V2.8 build 0208-797bf75
A command line e-book compiler
Copyright Amazon.com and its Affiliates 2013
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Info:I9026:option: (hidden) amazon creator tool or pipeline

Info:I9014:option: -verbose: Verbose output

Info(prcgen):I1048: Unpacking ePub file
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Interestingly, when I convert the file to html5 via a plugin (in5), it compiles (with errors but that's not the problem). Any suggestions as to why it won't compile the epub created by InDesign?

Paul