[luatex] Debugging the error 'Expected a string for (S), not: nil'

Patrick Gundlach patrick at gundla.ch
Sun Nov 22 20:51:28 CET 2015


Hello again,

I get the error

"Expected a string for (S), not: nil"

which seems to be related to callbacks. How can I debug, what is wrong with my code? Is something wrong with my callback re-defintions? 

Patrick





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