X_QUERY_SINGLE_INVALID
Means
a query declares single: as something other than a boolean
Typical cause
generated code or a JS caller wrote single: "yes" or 1
Fix
write single: true for a read of one object, or drop the key for a list read
a query declares single: as something other than a boolean
generated code or a JS caller wrote single: "yes" or 1
write single: true for a read of one object, or drop the key for a list read