I can only take a guess at your issues. I have no expertise with the AndersonDarlingTest function in WL. The error is pointing generally to some issues with the data you are importing from an Excel (xslx) spreadsheet. So I used what data was available from your problem particularly the error message output you pasted. (ref/AndersonDarlingTest)
data = {{151.6, 151.9, 149.8, 148.8}, {151.9, 150.9, 148.8,
147.9}, {150.5, 150.9, 148.2, 147.9}, {149.9, 148.8, 150.7,
151.}, {152.6, 152.2, 153.4, 149.9}, {151., 152.27, 153.87,
150.93}, {152.65, 152.21, 151.67, 150.21}, {153.6, 151.19, 152.56,
154.01}, {150.92, 154.21, 149.75, 151.33}}
Took out the snips (41,49) and made certain that the data is rectangular
Dimensions[data]
Gives rectangular value {9,4}.
AndersonDarlingTest[data]
Gives 0.999731
So I would guess that the issues is as stated from the message that somewhere in your data there is data or missing data that renders the data set your dealing with as non-rectangular or not all real numbers.. Unless your data needs to remain a secret (proprietary data, patient information or personal data) it would be nice of you to provide a sample sheet. Maybe someone from this community can help.
Thanks