TermExcelerator Object reference not set to an instance of an object

Hi folks,

I used a TermExcelerator TB for a few projects but the above error started to appear when I was doing various different things. TB recognition and search stopped working. Even when I click on the source text, the message would appear and not let me copy text from source. I thought the excel doc. might have been corrupted so saved a new one. I un- and re-installed the plug-in, and I am now getting this message when even trying to add the TB to the project, after selecting the 'Use' dropdown menu in the screenshot, and clicking TermExcelerator Terminology Provider, I get the error.

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Error details attached also. Any help much appreciated.

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<SDLErrorDetails time="28/10/2021 16:52:29">
<ErrorMessage>Object reference not set to an instance of an object.</ErrorMessage>
<Exception>
<Type>System.NullReferenceException, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</Type>
<HelpLink />
<Source>Sdl.Community.TermExcelerator</Source>
<HResult>-2147467261</HResult>
<StackTrace><![CDATA[ at Sdl.Community.TermExcelerator.TerminologyProviderExcel.GetDefinitionLanguages()
at Sdl.Community.TermExcelerator.TerminologyProviderExcel.GetLanguages()
at Sdl.ProjectApi.Implementation.TermbaseApi.ProjectTermbaseLanguageIndexGuessor.<>c__DisplayClass4_0.<.ctor>b__0()
at System.Lazy`1.CreateValue()
at System.Lazy`1.LazyInitValue()
at System.Lazy`1.get_Value()
at Sdl.ProjectApi.Implementation.TermbaseApi.ProjectTermbaseLanguageIndexGuessor.Guess(Language language)
at Sdl.ProjectApi.Implementation.TermbaseApi.ProjectTermbaseProvider.GuessLanguageIndexes()
at Sdl.TranslationStudio.ProjectManagement.Terminology.ProjectTermbasesControl.TermbasesChanged()
at Sdl.TranslationStudio.ProjectManagement.Terminology.ProjectTermbasesControl.Termbases_ItemAdded(Object sender, ItemCollectionAddedEventArgs`1 eventArgs)
at System.EventHandler`1.Invoke(Object sender, TEventArgs e)
at Sdl.ProjectApi.Implementation.TermbaseApi.ItemCollection`1.OnItemAdded(T item)
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

Thanks, 

Darán