Error An error occurred while overwriting the item. Feature Layer will not overwrite anymore

[SlimmingWorldUK]

Hi,

I wonder if someone could help me. Each month I go into our content to overwrite some feature layers.

This month, for each feature layer I try to overwrite with the latest information, I get this error

"Error

An error occurred while overwriting the item."

When i go back to the content screen the shape file looks like it has changed as the edited date has updated, but the feature layer is still on old version. 

I have tried to overwrite using older version which were successful in the past and these also give me the error. 

thanks in advance