Sorry for the inconvenience.
Error in isRental, error: [Microsoft][ODBC Microsoft Access Driver] Operation must use an updateable query. - Err.Number:-2147467259 - SQL:SELECT rental FROM products WHERE idProduct=3
Additional information: it seems that your database folder (comersus/database) or database file (comersus/database/comersus.mdb) has not defined all permissions. It's possible also that your database file has Read-Only attribute checked. Sometimes this error appears if your ODBC driver is outdated. Read installation instructions. You can also get detailed instructions for some operating systems at the forum.
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