Sorry for the inconvenience.
Error in isRental error MicrosoftODBC Microsoft Access Driver Operation must use an updateable query - ErrNumber-2147467259 - SQLSELECT rental FROM products WHERE idProduct77
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 Sometimes this error appears if your ODBC driver is outdated.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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