Unable to cast object of type 'Wisej.Web.Form' to type 'Wisej.Core.lWisejControl'.

Hi Justice

The issue that you comment could be caused for:

A. An old code project opened in a computer with a more newer version of wisej sdk.

Here documentation about it https://wisej.com/docs/2.2/html/UpgradeFromWisej1.htm

B. Using older templates, with newer sdk

C.- Referencing older dlls with more newer templates

Hot to be help you

Regards