I am getting error while editing any schema or creating new schema in sandbox environment. I see one of our out of box schema(nms:seedMember) got corrupted and when I try to regenerate the same, getting xtk/170030 error so basically this error is not allowing me to do any modification in any of the schema. Kindly help me if you have encountered similar issue.
There is one schema in your system which does not have the correct definition or missing values in the <srcSchema tag.
Check for schemas by last modified and see which schemas were created just before you started to have the issue. Then check which schema does not have a correct definition of the srcSchema tag. That is causing issues.
When you create a new schema , all schemas are regenerated to generate new links which can be created by the new schema and hence it does allow to create anything if even one schema is logically wrong.