Hi, the error seems to be with another plugin when it tries to parse text codes, since the code is obfuscated we can't really know more than that, but most likely that other plugin does not handle drawing "blank" strings of text ("").
It seems like you already fixed the issue this time, but if you get this error again, you would want to check to make sure everything set to display via the Quest Info Order parameter is filled out, both in the Text Options at the bottom of the parameters or from within each of your quest parameters themselves.