Hi Yujun,
For HCP trial, every developer will have two schemas (DEV_XXX and NEO_XXX) by default. So, NEO_XXX should be your development schema, meanwhile DEV_XXX is the private schema of your developer user. And usually we need to create objects in NEO_XXX schema instead of DEV_XXX.
However, I don't understand how can this table be created...
Best regards,
Wenjun