When I created package my dll was not added to zip file , also my lines( to add dlll )  in manifest was missing , so i unzipped the folder and kept the dll inise folder and modified the manifest again   , added "<file> <name>sample.dll</name></file>" manually  . Again zipped the folder . But when I install the zip file , the dll's are created inside bin/Module/ sample.dll , not like bin/sample.dll .

I had no idea why it creates  a folder name  "Module" inside "Bin and it keeps my sample.dll inside the Module folder

file>path>bin</path>name>TwentyFourConsulting.Securia.WebShop.UI.DNN.dll</name>file>

this will work

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In Module definition when u click create package , there will be filename textbox and  two check box 

1   Create Manifest File?

2   "Supports Private Assembly SubFolder"?  checkbox

        unckeck Supports Private Assembly SubFolder checkbox , and click create , this will solve you issue

hope this help you