We have this older website running Umbraco 4.7.2, and it seems to be restarting an awfull many times (+90 times a day), in the logtable, we found a lot of errors like this.

Any suggestions on how to fix these ?

Kind regards Rik

Can't import MacroEngine 'umbraco.MacroEngines.RazorMacroEngine': System.ArgumentException: An item with the same key has already been added.
at System.Collections.Generic.Dictionary2.Insert(TKey key, TValue value, Boolean add)

   at umbraco.cms.businesslogic.macro.MacroEngineFactory.getEngines(List1 types)
Can't import MacroEngine 'uComponents.Core.MacroEngines.StaticFileMacroEngine': System.ArgumentException: An item with the same key has already been added.
at System.Collections.Generic.Dictionary2.Insert(TKey key, TValue value, Boolean add)

   at umbraco.cms.businesslogic.macro.MacroEngineFactory.getEngines(List1 types)
Can't import MacroEngine 'uComponents.Core.MacroEngines.XsltMacroEngine': System.ArgumentException: An item with the same key has already been added.
at System.Collections.Generic.Dictionary2.Insert(TKey key, TValue value, Boolean add)

   at umbraco.cms.businesslogic.macro.MacroEngineFactory.getEngines(List1 types)
Can't import MacroEngine 'uComponents.Core.MacroEngines.XsltMacroEngine': System.ArgumentException: An item with the same key has already been added.
at System.Collections.Generic.Dictionary2.Insert(TKey key, TValue value, Boolean add)

   at umbraco.cms.businesslogic.macro.MacroEngineFactory.getEngines(List1 types)
Can't import MacroEngine 'umbraco.MacroEngines.RazorMacroEngine': System.ArgumentException: An item with the same key has already been added.
at System.Collections.Generic.Dictionary2.Insert(TKey key, TValue value, Boolean add)

   at umbraco.cms.businesslogic.macro.MacroEngineFactory.getEngines(List1 types)
Can't import MacroEngine 'umbraco.MacroEngines.RazorMacroEngine': System.ArgumentException: An item with the same key has already been added.
at System.Collections.Generic.Dictionary2.Insert(TKey key, TValue value, Boolean add)

   at umbraco.cms.businesslogic.macro.MacroEngineFactory.getEngines(List1 types)
Can't import MacroEngine 'uComponents.Core.MacroEngines.StaticFileMacroEngine': System.ArgumentException: An item with the same key has already been added.
at System.Collections.Generic.Dictionary2.Insert(TKey key, TValue value, Boolean add)

   at umbraco.cms.businesslogic.macro.MacroEngineFactory.getEngines(List1 types)
Can't import MacroEngine 'umbraco.MacroEngines.RazorMacroEngine': System.ArgumentException: An item with the same key has already been added.
at System.Collections.Generic.Dictionary2.Insert(TKey key, TValue value, Boolean add)

   at umbraco.cms.businesslogic.macro.MacroEngineFactory.getEngines(List1 types)
Can't import MacroEngine 'uComponents.Core.MacroEngines.StaticFileMacroEngine': System.ArgumentException: An item with the same key has already been added.
at System.Collections.Generic.Dictionary2.Insert(TKey key, TValue value, Boolean add)

   at umbraco.cms.businesslogic.macro.MacroEngineFactory.getEngines(List1 types)
Can't import MacroEngine 'uComponents.Core.MacroEngines.XsltMacroEngine': System.ArgumentException: An item with the same key has already been added.
at System.Collections.Generic.Dictionary2.Insert(TKey key, TValue value, Boolean add)

   at umbraco.cms.businesslogic.macro.MacroEngineFactory.getEngines(List1 types)
Can't import MacroEngine 'uComponents.Core.MacroEngines.StaticFileMacroEngine': System.ArgumentException: An item with the same key has already been added.
at System.Collections.Generic.Dictionary2.Insert(TKey key, TValue value, Boolean add)

   at umbraco.cms.businesslogic.macro.MacroEngineFactory.getEngines(List1 types)
Can't import MacroEngine 'uComponents.Core.MacroEngines.XsltMacroEngine': System.ArgumentException: An item with the same key has already been added.
at System.Collections.Generic.Dictionary2.Insert(TKey key, TValue value, Boolean add)

   at umbraco.cms.businesslogic.macro.MacroEngineFactory.getEngines(List1 types)
Can't import MacroEngine 'uComponents.Core.MacroEngines.XsltMacroEngine': System.ArgumentException: An item with the same key has already been added.
at System.Collections.Generic.Dictionary2.Insert(TKey key, TValue value, Boolean add)

   at umbraco.cms.businesslogic.macro.MacroEngineFactory.getEngines(List1 types)
Can't import MacroEngine 'umbraco.MacroEngines.RazorMacroEngine': System.ArgumentException: An item with the same key has already been added.
at System.Collections.Generic.Dictionary2.Insert(TKey key, TValue value, Boolean add)

   at umbraco.cms.businesslogic.macro.MacroEngineFactory.getEngines(List1 types)
Can't import MacroEngine 'uComponents.Core.MacroEngines.XsltMacroEngine': System.ArgumentException: An item with the same key has already been added.
at System.Collections.Generic.Dictionary2.Insert(TKey key, TValue value, Boolean add)

   at umbraco.cms.businesslogic.macro.MacroEngineFactory.getEngines(List1 types)
Can't import MacroEngine 'umbraco.MacroEngines.RazorMacroEngine': System.ArgumentException: An item with the same key has already been added.
at System.Collections.Generic.Dictionary2.Insert(TKey key, TValue value, Boolean add)

   at umbraco.cms.businesslogic.macro.MacroEngineFactory.getEngines(List1 types)
Can't import MacroEngine 'uComponents.Core.MacroEngines.StaticFileMacroEngine': System.ArgumentException: An item with the same key has already been added.
at System.Collections.Generic.Dictionary2.Insert(TKey key, TValue value, Boolean add)

   at umbraco.cms.businesslogic.macro.MacroEngineFactory.getEngines(List1 types)