Base 64 error

Hello, I have a problem with Trados 2021 and I really need help. Trados support didn't help at all and told me to post this here.

A message with a Base 64 error is showing and nothing that I do makes it go away. I changed the name of the project, deleted ans installed trados and the message is still there:
"The entry is not a valid Base 64 character string, as it contains a non-base 64 character, more than two padding characters, or an illegal character between padding characters." 

PLEASE help

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  • <?xml version="1.0"?>

    -<SDLErrorDetails time="06/04/2021 12:30:33">

    <ErrorMessage>A entrada não é uma cadeia de caracteres de Base 64 válida, pois contém um caractere que não é de base 64, mais de dois caracteres de preenchimento ou um caractere ilegal entre os caracteres de preenchimento. </ErrorMessage>


    -<Exception>

    <Type>System.FormatException, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</Type>

    <HelpLink/>

    <Source>mscorlib</Source>

    <HResult>-2146233033</HResult>


    -<StackTrace>

    -<![CDATA[ em System.Convert.FromBase64_Decode(Char startInputPtr, Int32 inputLength, Byte startDestPtr, Int32 destLength)
    em System.Convert.FromBase64CharPtr(Char* inputPtr, Int32 inputLength)
    em System.Convert.FromBase64String(String s)
    em Sdl.Core.Cryptography.SymmetricCryptographer.Decrypt(String encryptedText)
    em Sdl.TranslationStudio.LanguageCloud.Subscription.Encrypter.Decrypt(String encryptedText)
    em Sdl.TranslationStudio.LanguageCloud.Subscription.EncryptedSubscriptionDataFileRepository.ReadContent()
    em Sdl.TranslationStudio.LanguageCloud.Subscription.SubscriptionLicense.LoadSubscriptionFromLocalStore()
    em Sdl.TranslationStudio.Common.Licencing.LicensingService.ShouldShowLicenseManager()
    em Sdl.TranslationStudio.Common.Licencing.LicensingService.StartupLicenseCheck()
    em Sdl.Desktop.Platform.Implementation.Studio.Run(ISplashScreen splashScreen, IEventAggregator eventAggregator)
    em Sdl.TranslationStudio.Application.Launcher.RunApplication()]]>
    </StackTrace>

    </Exception>


    -<Environment>

    <ProductName>SDL Trados Studio</ProductName>

    <ProductVersion>Studio16</ProductVersion>

    <EntryAssemblyFileVersion>16.1.4.4184</EntryAssemblyFileVersion>

    <OperatingSystem>Microsoft Windows 10 Home Single Language</OperatingSystem>

    <ServicePack>NULL</ServicePack>

    <OperatingSystemLanguage>1046</OperatingSystemLanguage>

    <CodePage>1252</CodePage>

    <LoggedOnUser>DESKTOP-7I7RGS9\loren</LoggedOnUser>

    <DotNetFrameWork>4.0.30319.42000</DotNetFrameWork>

    <ComputerName>DESKTOP-7I7RGS9</ComputerName>

    <ConnectedToNetwork>True</ConnectedToNetwork>

    <PhysicalMemory>4057488 MB</PhysicalMemory>

    </Environment>

    </SDLErrorDetails>

  • <?xml version="1.0"?>

    -<SDLErrorDetails time="06/04/2021 12:30:33">

    <ErrorMessage>A entrada não é uma cadeia de caracteres de Base 64 válida, pois contém um caractere que não é de base 64, mais de dois caracteres de preenchimento ou um caractere ilegal entre os caracteres de preenchimento. </ErrorMessage>


    -<Exception>

    <Type>System.FormatException, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</Type>

    <HelpLink/>

    <Source>mscorlib</Source>

    <HResult>-2146233033</HResult>


    -<StackTrace>

    -<![CDATA[ em System.Convert.FromBase64_Decode(Char startInputPtr, Int32 inputLength, Byte startDestPtr, Int32 destLength)
    em System.Convert.FromBase64CharPtr(Char* inputPtr, Int32 inputLength)
    em System.Convert.FromBase64String(String s)
    em Sdl.Core.Cryptography.SymmetricCryptographer.Decrypt(String encryptedText)
    em Sdl.TranslationStudio.LanguageCloud.Subscription.Encrypter.Decrypt(String encryptedText)
    em Sdl.TranslationStudio.LanguageCloud.Subscription.EncryptedSubscriptionDataFileRepository.ReadContent()
    em Sdl.TranslationStudio.LanguageCloud.Subscription.SubscriptionLicense.LoadSubscriptionFromLocalStore()
    em Sdl.TranslationStudio.Common.Licencing.LicensingService.ShouldShowLicenseManager()
    em Sdl.TranslationStudio.Common.Licencing.LicensingService.StartupLicenseCheck()
    em Sdl.Desktop.Platform.Implementation.Studio.Run(ISplashScreen splashScreen, IEventAggregator eventAggregator)
    em Sdl.TranslationStudio.Application.Launcher.RunApplication()]]>
    </StackTrace>

    </Exception>


    -<Environment>

    <ProductName>SDL Trados Studio</ProductName>

    <ProductVersion>Studio16</ProductVersion>

    <EntryAssemblyFileVersion>16.1.4.4184</EntryAssemblyFileVersion>

    <OperatingSystem>Microsoft Windows 10 Home Single Language</OperatingSystem>

    <ServicePack>NULL</ServicePack>

    <OperatingSystemLanguage>1046</OperatingSystemLanguage>

    <CodePage>1252</CodePage>

    <LoggedOnUser>DESKTOP-7I7RGS9\loren</LoggedOnUser>

    <DotNetFrameWork>4.0.30319.42000</DotNetFrameWork>

    <ComputerName>DESKTOP-7I7RGS9</ComputerName>

    <ConnectedToNetwork>True</ConnectedToNetwork>

    <PhysicalMemory>4057488 MB</PhysicalMemory>

    </Environment>

    </SDLErrorDetails>

  • <?xml version="1.0"?>

    -<SDLErrorDetails time="08/04/2021 18:28:10">

    <ErrorMessage>A entrada não é uma cadeia de caracteres de Base 64 válida, pois contém um caractere que não é de base 64, mais de dois caracteres de preenchimento ou um caractere ilegal entre os caracteres de preenchimento. </ErrorMessage>


    -<Exception>

    <Type>System.FormatException, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</Type>

    <HelpLink/>

    <Source>mscorlib</Source>

    <HResult>-2146233033</HResult>


    -<StackTrace>

    -<![CDATA[ em System.Convert.FromBase64_Decode(Char* startInputPtr, Int32 inputLength, Byte* startDestPtr, Int32 destLength)
    em System.Convert.FromBase64CharPtr(Char* inputPtr, Int32 inputLength)
    em System.Convert.FromBase64String(String s)
    em Sdl.Core.Cryptography.SymmetricCryptographer.Decrypt(String encryptedText)
    em Sdl.TranslationStudio.LanguageCloud.Subscription.Encrypter.Decrypt(String encryptedText)
    em Sdl.TranslationStudio.LanguageCloud.Subscription.EncryptedSubscriptionDataFileRepository.ReadContent()
    em Sdl.TranslationStudio.LanguageCloud.Subscription.SubscriptionLicense.LoadSubscriptionFromLocalStore()
    em Sdl.TranslationStudio.Common.Licencing.LicensingService.ShouldShowLicenseManager()
    em Sdl.TranslationStudio.Common.Licencing.LicensingService.StartupLicenseCheck()
    em Sdl.Desktop.Platform.Implementation.Studio.Run(ISplashScreen splashScreen, IEventAggregator eventAggregator)
    em Sdl.TranslationStudio.Application.Launcher.RunApplication()]]>
    </StackTrace>

    </Exception>


    -<Environment>

    <ProductName>SDL Trados Studio</ProductName>

    <ProductVersion>Studio16</ProductVersion>

    <EntryAssemblyFileVersion>16.1.4.4184</EntryAssemblyFileVersion>

    <OperatingSystem>Microsoft Windows 10 Home Single Language</OperatingSystem>

    <ServicePack>NULL</ServicePack>

    <OperatingSystemLanguage>1046</OperatingSystemLanguage>

    <CodePage>1252</CodePage>

    <LoggedOnUser>DESKTOP-7I7RGS9\loren</LoggedOnUser>

    <DotNetFrameWork>4.0.30319.42000</DotNetFrameWork>

    <ComputerName>DESKTOP-7I7RGS9</ComputerName>

    <ConnectedToNetwork>True</ConnectedToNetwork>

    <PhysicalMemory>4057488 MB</PhysicalMemory>

    </Environment>

    </SDLErrorDetails>