Hi Mirchell
in your Fact tables you have data for an Account with the ID '105050104'. But this account is not existing in your Account dimension.
To resolve this issue you can either add this account to your account dimension and reprocess the cube or you have to delete all data with account = '105050104' from the fact table. This can be done via MS SQL Server Manager directly on the Fact table. After that you have to process the cube also.
More important is to check how this data was generated. Check your Logicfiles or custom import packages. This can happen when you write a new record referring to a property of the original account via logic. Logic does not check if the destination members are valid.
regards
Jörg