My host has moved my site to a new server and now all the sites are showing DNN Error and the "Return to Site" button

From the Portals/_default/logs

we are getting this

2015-09-06 18:38:49,074 [sknet185][Thread:58][ERROR] DotNetNuke.Services.Exceptions.Exceptions - ~/Default.aspx?error=An unexpected error has occurred&content=0
System.NullReferenceException: Object reference not set to an instance of an object.
at DotNetNuke.Entities.Portals.PortalSettingsController.ConfigureActiveTab(PortalSettings portalSettings)
at DotNetNuke.Framework.DefaultPage.InitializePage()
at DotNetNuke.Framework.DefaultPage.OnInit(EventArgs e)
at System.Web.UI.Control.InitRecursive(Control namingContainer)
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
2015-09-06 18:38:49,403 [sknet185][Thread:14][FATAL] DotNetNuke.Framework.PageBase - An error has occurred while loading page.
System.NullReferenceException: Object reference not set to an instance of an object.
at DotNetNuke.Entities.Portals.PortalSettingsController.ConfigureActiveTab(PortalSettings portalSettings)
at DotNetNuke.Framework.DefaultPage.InitializePage()
at DotNetNuke.Framework.DefaultPage.OnInit(EventArgs e)
at System.Web.UI.Control.InitRecursive(Control namingContainer)
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
2015-09-06 18:38:49,404 [sknet185][Thread:14][ERROR] DotNetNuke.Services.Exceptions.Exceptions - ~/Default.aspx?error=terminate
System.NullReferenceException: Object reference not set to an instance of an object.
at DotNetNuke.Entities.Portals.PortalSettingsController.ConfigureActiveTab(PortalSettings portalSettings)
at DotNetNuke.Framework.DefaultPage.InitializePage()
at DotNetNuke.Framework.DefaultPage.OnInit(EventArgs e)
at System.Web.UI.Control.InitRecursive(Control namingContainer)
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
2015-09-06 18:38:49,409 [sknet185][Thread:14][ERROR] DotNetNuke.Services.Exceptions.Exceptions - DotNetNuke.Services.Exceptions.PageLoadException: Object reference not set to an instance of an object. ---> System.NullReferenceException: Object reference not set to an instance of an object.
at DotNetNuke.Entities.Portals.PortalSettingsController.ConfigureActiveTab(PortalSettings portalSettings)
at DotNetNuke.Framework.DefaultPage.InitializePage()
at DotNetNuke.Framework.DefaultPage.OnInit(EventArgs e)
at System.Web.UI.Control.InitRecursive(Control namingContainer)
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
--- End of inner exception stack trace ---

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From the DB EventLog we get

PAGE_LOAD_EXCEPTION 

<LogProperties><LogProperty><PropertyName>AbsoluteURL</PropertyName><PropertyValue>/default.aspx</PropertyValue></LogProperty><LogProperty><PropertyName>DefaultDataProvider</PropertyName><PropertyValue>DotNetNuke.Data.SqlDataProvider, DotNetNuke</PropertyValue></LogProperty><LogProperty><PropertyName>ExceptionGUID</PropertyName><PropertyValue>eb374f60-2297-4bce-9973-fe1659ecc6ab</PropertyValue></LogProperty></LogProperties>

=================================

and this is in the LogFalilures file

at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)</InnerStackTrace><Source /><FileName /><FileLineNumber>0</FileLineNumber><FileColumnNumber>0</FileColumnNumber><Method>DotNetNuke.Entities.Portals.PortalSettingsController.ConfigureActiveTab</Method></Exception></log><log LogGUID="91545580-5a66-4467-8b4e-4ab04503de0f" LogFileID="" LogTypeKey="PAGE_LOAD_EXCEPTION" LogUserID="-1" LogEventID="-1" LogUserName="" LogPortalID="-1" LogPortalName="" LogCreateDate="9/5/2015 6:26:43 AM" LogCreateDateNum="0" BypassBuffering="False" LogServerName="sknet185" LogConfigID=""><LogProperties><LogProperty><PropertyName>AbsoluteURL</PropertyName><PropertyValue>/Default.aspx</PropertyValue></LogProperty><LogProperty><PropertyName>DefaultDataProvider</PropertyName><PropertyValue>DotNetNuke.Data.SqlDataProvider, DotNetNuke</PropertyValue></LogProperty><LogProperty><PropertyName>ExceptionGUID</PropertyName><PropertyValue>c0622b6c-256d-4c25-b50c-cb03c3d292e7</PropertyValue></LogProperty></LogProperties><Exception><AssemblyVersion /><PortalId>0</PortalId><UserId>0</UserId><TabId>0</TabId><RawUrl /><Referrer /><UserAgent /><ExceptionHash>SeQTb4V/8EiEDLVw8JGVgw==</ExceptionHash><Message>Object reference not set to an instance of an object.</Message><StackTrace /><InnerMessage>Object reference not set to an instance of an object.</InnerMessage><InnerStackTrace> at DotNetNuke.Entities.Portals.PortalSettingsController.ConfigureActiveTab(PortalSettings portalSettings)
at DotNetNuke.Framework.DefaultPage.InitializePage()
at DotNetNuke.Framework.DefaultPage.OnInit(EventArgs e)
at System.Web.UI.Control.InitRecursive(Control namingContainer)
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)00

AbsoluteURL/default.aspx

DefaultDataProviderDotNetNuke.Data.SqlDataProvider, DotNetNuke

ExceptionGUID2f40adb3-a1e3-4927-a672-fd39fa76d93f7.4.1

-1-1-1/http://poisk-zakona.ru/</Referrer><UserAgent>Mozil... (compatible; MSIE 6.0; Windows NT 5.1; SV1; FunWebProducts; .NET CLR 1.1.4322; PeoplePal 6.2)DlvAyN9CBw+pkyCjsn57yA==Object reference not set to an instance of an object.Object reference not set to an instance of an object. at DotNetNuke.Entities.Portals.PortalSettingsController.ConfigureActiveTab(PortalSettings portalSettings)
at DotNetNuke.Framework.DefaultPage.InitializePage()
at DotNetNuke.Framework.DefaultPage.OnInit(EventArgs e)
at System.Web.UI.Control.InitRecursive(Control namingContainer)

==========================================

Any help will be appreciated

Anthony