The following module was built either with optimizations enabled or without debug information: Microsoft ASP.NET

Symptom: Solution includes a web project and a class library(may be more). But can not hit any break points in class library as it says ‘no symbols has been loaded’

• Try 'Configuration Manager' – make sure all project configurations are set to ‘debug mode’ and clean the solution
• Try web config – make sure you have set [debug=’true’] in compilation section.
• Remove the assembly reference and try adding it again.