Manual Translation errors in SEN

Hi experts,

To perform manual translation, I exported the file (to be translated) in MS Word file. Then I made few manual translations and I tried to import.

1. While importing, I am getting below prompt messages twice.

The last time you opened 'ImportTranslation.dot', it caused a serious error. Do you still want to open it?

2. Though I created a text unit inside the Group with Document Type as Translation Information with target language, I am getting below error message when I try to import the translated file.

"No text unit for translation information found to indicate the root group for cloning".

Group structure:

Because of these messages, I am unable to perform manual translation.

Please guide me.