Why i do not have "Custom" category when trying to add a new web part

Question

I have deployed a .wsp solution to my web application as follow, using Visual studio:-
But when I try to add this web part to my brand new enterprise wiki site collection, I can not see any “custom” web part area as follow:-
Baring in mind that we have an old site collection also of type enterprise wiki and is inside the same web application, which have the “custom” tab visible as follow:-

Answer 1

Hello john, 
did you try to disable and enable again the WebApp feature that hosts the webpart, on central administration?
If it's not working, try to change the scope of you feature to "site collection" instead of "web application"
now i try retracting then re-deploying the farm solution again but still it will work on the old site collection only.
Now seems i am a bit confused as i do not have much knowledge in developing solution. now the solution i deployed is mainly for fixing Redirect problem in SharePoint managed metadata navigation, the OnInit method is as follow:-
protected override void OnInit(EventArgs e)
var request = HttpContext.Current.Request;
var response = HttpContext.Current.Response;
if (!String.IsNullOrEmpty(request.QueryString["TreeField"])
&& !String.IsNullOrEmpty(request.QueryString["TreeValue"]))
response.Redirect(String.Format("{0}?TreeField={1}&TreeValue={2}",
SPContext.Current.ListItem.ParentList.DefaultViewUrl,
request.QueryString["TreeField"],
request.QueryString["TreeValue"]));
else if (!String.IsNullOrEmpty(request.QueryString["TreeField"]))
response.Redirect(String.Format("{0}?TreeField={1}",
SPContext.Current.ListItem.ParentList.DefaultViewUrl,
request.QueryString["TreeField"]));
base.OnInit(e);
and the solution have the following settings inside the visual studio , where the Site URL refers to my development machine URL . but this did not cause any problem inside the live serve old site collection:-
and when i deploy the farm isolation i did the following steps :-
- I copy the wsp from the visual studio project.
- Then i run the following command inside the Live server "stsadm -o addsolution –filename [c:....]\WikiKnowledgeBaseRedirect.wsp"
- Inside the live server i went to "central administration>>system settings>> Manage farm solutions>>click on WikiKnowledgeBaseRedirect>>click on deploy solution >>select the web application from the “Deploy To?" drop
down".
now as i mentioned before the wsp worked well inside my old site collection, although the site URL refers to the test server site collection (not sure if this was overridden when I deployed the solution to live server).  but inside the new site collection
i can not find this solution inside the "site setting>>site collection features" nor inside the "site settings>>web designer gallery>> web part"? can u advice based on the above ?