calling has for the own secret (such a proposition does not exist)
the pre-checks of the transformer update failed. In particular, the event law ($\Theta^+$) failed due to the lack of an event proposition while the law required it. The transformer should most likely only add the single proposition relating to the call that it is transforming.
Fixes two bugs in the Transparent Transformer:
has
for the own secret (such a proposition does not exist)