I'm a beginner at this, I hope someone can help me..

I am modifying a demo web site in sharepoint 2013 that is published with dynamic AX R3 (Contoso), basically I have a full working web site. The demo website

Lets imagine that I want a html button in this example just to make it work and later be able to write relevant code for my project.

When I try to use the web-part script editor to add a HTML button: The button "Hello"

...but when I press "save" in the sharepoint ribbon, this happens: Wrong message And the button won't be saved. I should mention that I have added other web-parts to the demo site, but when I want to add HTML or JavaScript in a script editor or in a content editor, it doesn't want to work.

So I googled and found out I could find the error message in the ULS logs and here it is:

04/29/2015 06:30:26.55 w3wp.exe (0x4054) 0x2B10 SharePoint Foundation Runtime tkau Unexpected System.Web.HttpRequestValidationException: A potentially dangerous Request.Form value was detected from the client (a3564034-4a21-4e0d-bd49-6cf261a10384scriptcontent=""). at System.Web.HttpRequest.ValidateString(String value, String collectionKey, RequestValidationSource requestCollection) at System.Web.HttpRequest.ValidateHttpValueCollection(HttpValueCollection collection, RequestValidationSource requestCollection) at System.Web.HttpRequest.get_Form() at Microsoft.SharePoint.SPGlobal.GetParametersFromHttpRequest(SPSite site, Boolean bAuthenticated) at Microsoft.SharePoint.SPGlobal.CreateSPRequestAndSetIdentity(SPSite site, String name, Boolean bNotGlobalAdminCode, String strUrl, Boolean bNotAddToContext, Byte[] UserToken, SPAppPrincipalToken appPrincipalToken, String userName, Boolean bIgnoreTokenTimeout, Boolean bAsAnonymous) at Microsoft.SharePoint.SPWeb.InitializeSPRequest() at Microsoft.SharePoint.SPWeb.EnsureSPRequest() at Microsoft.SharePoint.WebControls.SPControl.EnsureSPWebRequest(SPWeb web) at Microsoft.SharePoint.WebControls.SPControl.SPWebEnsureSPControl(HttpContext context) at Microsoft.SharePoint.ApplicationRuntime.SPRequestModule.GetContextWeb(HttpContext context) at Microsoft.SharePoint.ApplicationRuntime.SPRequestModule.PostResolveRequestCacheHandler(Object oSender, EventArgs ea) at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) be78019d-ccb5-90c5-d26a-0b8ce5adad13

Any ideas? Thanks in advance.

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