Hello I get an server error 500 message when I try to post a challange ,I can accept a posted challange from other players ,and have no trouble with the correspondence games .
Are you using a custom komi setting by any chance, where the box might be empty?
I think I read in another post when someone was challenging a bot that this was an issue.
Just a guess 
I will check ta.
As per our discussion in PM, this should help upload the screenshot
Then it should be just a matter of selecting the image from your device
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It is also possible to simply paste an image from your clipboard into a post. If you’re using Windows’ built-in Snipping Tool, you can take the screen capture, press ctrl+a followed by ctrl+c in the Snipping Tool, then ctrl+v when typing your post and it will upload the image automatically. (This is for Windows computers - I have no information on the best way to do this on Mac.)
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Okay, from the first glance it seems the “periods” box is empty which our server probably cannot interpret. Adding a number should solve the issue.
There should be a number of how many times the player can exceed the byo yomi period before timing out (you can think of it as sort of “lives”)
Most often people chose between 3 to 5
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Grateful greetings yes that was it I noticed the period error as soon as I transferred the photo ,thanks for your assistance in solving that .
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My pleasre.
These boxes really should not be deletable.
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My guess wasn’t too far off 
Thanks @AdamR for teaching me how to upload screenshot (I did not know that)