Gautam Such errors are commonly seen in maps when there is a new field added in any of it's associated tables. Then Map then naturally looks for a field mapping for the new field created in the table. If there is a field without a mapping specified, and the map is used in the code it will throw error unable to select this field. As Julian suggested above, Please go through the mappings node in the maps used in the code, and looks for a missing field mapping. Once you map that open field to map correctly this issue will be fixed.
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