pypxlib.PXError

[Das332021]

I'am writing a code that read data from a table contain 3 lignes of data and inserting data in another table .
When i run the code for the first time it works fine but then it gives me this error:
pypxlib.PXError: Could not retrieve row 5 of file Y:.......\Client.db.
Number of records counted in blocks does not match number of records in header (3 != 17)
Number of records counted in blocks does not match number of records in header (184 != 42)
PXLib: Could not find record in database.
PXLib: Could not read data for record with number 5.

I don't understand this numbers row 5 in the table that i read data from it come from where and also 184, 42, 17 !!! .
Please someone help me.
And thank you.