I see two things.
.IMPORT is specifying DATA (i.e. FastLoad format without indicators). I doubt that's actually the format of your input file. More likely you need something like VARTEXT ',' and the USING fields should be only VARCHAR. Remember that USING describes the input data, not the table.
Also, the USING statement above is missing the parentheses around (VARCHAR(50)).
I see two things.
.IMPORT is specifying DATA (i.e. FastLoad format without indicators). I doubt that's actually the format of your input file. More likely you need something like VARTEXT ',' and the USING fields should be only VARCHAR. Remember that USING describes the input data, not the table.
Also, the USING statement above is missing the parentheses around (VARCHAR(50)).