Marbanyaanswered grow question 17 hours ago I have the same issue. This is what I have found to work.
1. When first posting your update, DO NOT select anything in the "Grow Techniques" area. Come back and do that later by Editing your week.
2. Do not have any values of "0" in the Nutrient Amount fields. I did this one day because I did not use Silica Blast that week, but wanted to leave it in the nutrients list. I changed the amount to "0" (zero), and it ERRORed out every time.
3. I upload images, but I come back and edit the Week to add captions to them.
After discovering the Grow Techniques bug and the "Nil Value" 'bug, I've not had an issue since.
Hope this helps.