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This error occurs when adding a delimited text file to ArcMap produces the error and the selected item could not be added to the map:
"The name of the field is invalid: valid names may contain letters, numbers or underscores. [field_name]"
One or more of the field names contain characters that are invalid for delimited text file data. Letters, numbers and underscores are the only valid characters for delimited text file field names.
The word inside the square brackets at the end of the message specifies the offending field name.
A field named: x-coord can be changed to x_coord
A field named: roads# can be changed to roads_