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I created an visual webpart. Works well, but when I tried to update (Update-SPSolution...) my solution, web part does not work any more. It shows error:<br />
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<pre><code id="code-10-27649986-1">	
Error [1] Web Part Menu
	 
Web Part Error: A Web Part or Web Form Control on this Page cannot be displayed or imported. The type XXX, XXX, Version=1.0.0.0, Culture=neutral, PublicKeyToken=XXX could not be found or it is not registered as safe.</code></pre>
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Seems like even visual studio refuses to deploy this application (something like: feature XXX is allready intalled. Use force attribute to ...) Even the rectract does not help.<br />
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What's going on? How do I fix this problem? I need to be able to update this solution.
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I created an visual webpart. Works well, but when I tried to update (Update-SPSolution...) my solution, web part does not work any more. It shows error:

(CODE)

Seems like even visual studio refuses to deploy this application (something like: feature XXX is allready intalled. Use force attribute to ...) Even the rectract does not help.

What's going on? How do I fix this problem? I need to be able to update this solution.

Safe control problem adter updating the WSP

Microsoft Sharepoint is a software platform and family of software products used for collaboration and web publishing combined. These capabilities include developing web sites, portals, intranets, content management systems, search engines, wikis, blogs, and other tools for business intelligence and collaboration. SharePoint has a Microsoft Office-like interface, and it is closely integrated with the Office suite.