Since you are running Windows, espeak is called via subprocess (since the cew C extension is not available), generating a temporary WAVE file for each fragment. Then, the contents of the latter are read and appended to create the global WAVE file.
From the log, it seems that the "append" operation failed, I cannot tell why from the log. It should not be a memory issue, as I see that your audio is below 1h of duration.
This string looks suspicious:
Quote:
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'The small king suddenly smiled. Γא£Truth be told, I stopped thinking of it as a curse years ago, lad.Γא¥ '
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as it seems to contain spurious characters ("Γא£", "Γא¥") --- albeit I cannot think a reason why it should make aeneas fail. In fact, from the log it seems that espeak synthesized it correctly. Anyway, you might want to clean that text and see if it helps.
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As I wrote, Windows at the moment is not officially supported by aeneas, mainly because I am the only developer and I do not use Windows.
If you want to run aeneas on your Windows machine, I strongly recommend using VirtualBox + Vagrant:
https://github.com/readbeyond/aeneas-vagrant