eM Client Crashes

Crashing eM Client
1

eM client doesnt open. Ir goes through the corruption checks and all have a green tick but upon opening the dialog disappears and a crash report appears. Ive copied the first part below. I can copy the rest but doesnt appear to be an easy way to copy it all.

Not had any issues previously. On W10:

eM Client (7.1.30794.0)
Windows: Microsoft Windows NT 10.0.16299.0, Framework: 4.0.30319.42000
The following error has occurred:
System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. —> System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. —> System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. —> System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. —> System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. —> System.NullReferenceException: Object reference not set to an instance of an object.
   at MailClient.Common.UI.Controls.ControlDataGrid.ControlDataGrid.CreateGroup(Object member)
   at MailClient.Common.UI.Controls.ControlDataGrid.ControlDataGrid.refreshGroupMemberships()
   at MailClient.Common.UI.Controls.ControlDataGrid.ControlDataGrid.SetDataSource[TItem](IBindableList1 source) &nbsp; &nbsp;at MailClient.UI.Controls.controlItemList2.<>c__DisplayClass172_2.b__1()
— End of inner exception stack trace —

2

One thing you could try is to remove the database and then restart eM Client. Close eM Client, and then rename C:\Users_username_\AppData\Roaming\eM Client. You may have to show hidden items in Explorer to do that.