this error leaves a .ldb file in the database folder, ive fixed this error locally following this guide:
http://www.telerik.com/community/forums/aspnet/editor/invalid-precision-value-inserting-data-into-microsoft-access-memo-field.aspx
however the problem persist on my server, ive updated the .cs class file as suggested, compiled and moved my bin folder overwriting the one on the webserver but i see that the files in the bin folder are not being compiled even if ive changed a class, im not much too sure about this error now, if it is because i cant recompile my class or something else.