I faced a issue similar to error #3. Check for the core component version in your package manager. If AEM version and core components version is not compatible , you might get that issue. Refer to this link 

Figured out - CSS can do the trick First Project into AEM, hence the above question.

I found one another blog also related to this.Composite Components in AEM using "cq:template" (prashantonkar.blogspot.com)Now my question is I would like to know the possibility of having 3 different components with change in their layout and alignment in a composite component. In the above blog lin...