Which preposition to use with inexactness

of Occurrences 5%

If one accepted the President's theory of organization, there was little to criticize in the report, except a certain inexactness of expression which indicated a lack of technical knowledge on the part of those who put the Covenant into final form.

in Occurrences 2%

A.Probably fogs and inexactness in the time kept by the trains.

Which preposition to use with  inexactness