So this is my screen right before the Synthesis (just in case I'm missing something)
Once I click the OK button the Synthesis animation plays but right before it's completed I get a black screen with the "An error has occured" message and get logget out. I have tried many times both yesterday and today and it's always the same result. I have a free youkai slot so that can't be the problem.
I also have 2 other kijimunas above level 80 and the synthesis always worked fine for them