oracle - Unable to import csv file into SQL developer -

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i have db table's 'csv file'.
truncated db table.
while importing csv file using sql developer, data aren't getting inserted.
amd following procedure given in tool.

step step procedure following:

right-click on table name , click import csv.
choose csv back-up file
choose header column in data preview screen , click next.
move available columns selected columns' side in choose columns screen , click next.
source , target data columns matching fine in column definition screen. click next.
click verify in finish screen. success on columns.
in last step, clicking on finish , loading tables there no data restored table.

can please me?


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