Unable to import files to smss

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This wizard will close because it encountered the following error: (Microsoft SQL Server)

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For help, click: https://go.microsoft.com:80/fwlink?ProdName=Microsoft%20SQL%20Server&ProdVer=16.0.5491.4&Evtsrc=Microsoft.SqlServer.Management.UI.WizardFrameworkErrorSR&EvtID=UncaughtException&LinkId=20476

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The ConnectionString property has not been initialized. (System.Data)

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Program Location:

at System.Data.Odbc.OdbcConnection.PermissionDemand()
at System.Data.Odbc.OdbcConnectionFactory.PermissionDemand(DbConnection outerConnection)
at System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions)
at System.Data.ProviderBase.DbConnectionClosed.TryOpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions)
at System.Data.ProviderBase.DbConnectionInternal.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory)
at System.Data.Odbc.OdbcConnection.Open()
at Microsoft.SqlServer.Dts.DtsWizard.DTSWizard.GetOpenedConnection(WizardInputs wizardInputs, String connEntryName)
at Microsoft.SqlServer.Dts.DtsWizard.TransformInfo.PopulateMetadata(WizardInputs wizardInputs)
at Microsoft.SqlServer.Dts.DtsWizard.StepFlatFileTables.OnLeavePage(LeavePageEventArgs e)
at Microsoft.SqlServer.Management.UI.WizardPage.RaiseLeavePage(WizardButton button)
at Microsoft.SqlServer.Management.UI.WizardForm.NextPage(WizardPage nextPage)
at Microsoft.SqlServer.Management.UI.WizardForm.Next_Click(Object sender, EventArgs e)