Discussions on "Problem saving your input"

I just received a similar error:

"We're sorry, there was a problem saving your input" 

{ "code" : "/api/status/error", "messages" : [ { "code" : "/api/status/error/mql/result", "info" : { "key" : "left", "newvalue" : "#9202a8c04000641f8000000006fb45cd", "value" : "#9202a8c04000641f80000000047b89e6" }, "message" : "This value is already in use. Please delete it first", "path" : "/user/spatialed/motorcycle/motorcycle_model/model_year_s", "query" : { "/user/spatialed/motorcycle/motorcycle_model/model_year_s" : [ { "connect" : "insert", "error_inside" : ".", "id" : "/guid/9202a8c04000641f8000000006fb4642", "index" : 0, "type" : [ { "connect" : "insert", "id" : "/user/spatialed/motorcycle/motorcycle_model_year" }, { "connect" : "insert", "id" : "/common/topic" } ] } ], "id" : "/guid/9202a8c04000641f8000000006fb45cd" } } ] }