this is not a mapping error and hence you are able to run the mapping without any issue.
the issue is data type and the value in the IDoc, as mentioned in the error you need to check the value at position 2186 to know the exact error.
most likely there is an issue with some date field,
you can check the IDoc schema definition for the data types other than string and try to check the corresponding values in your IDoc payload for the same.
