i managed to export the setting for posts only successfully and during the import i got this error :
CSV import completed. Imported 3498 rows. One or more errors occured while importing:
Columns number mismatch.
The following lines could not be imported:
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4838, 4839, 4855, 4856, 4857, 4858, 4866, 4867, 4868, 4869, 4870, 4871, 4872, 4873
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