This could be due to one of the following reasons:

• Your computer does not meet all the software requirements for displaying Datasheet view.
• If the list or or the current view does not support Datasheet view, the Edit in Datasheet button is not shown on the toolbar. For example, an image gallery list and the Explorer view of a document library do not support the Datasheet view.
• An error occurred while accessing information about the list structure or the view definition. Try refreshing the view.

If you do not see any data in the view, it could be because either the server is busy or not found, or some other error occurred. Close the list and try viewing the list at a later time.

You might not see some rows or columns in the view due one or more of the following reasons:

• You applied a filter, or a filter is specified as part of the view definition.

  To check if any filters are applied in the view, make sure the drop-down arrow in the column headers appear normal. If a column is filtered, the drop-down arrow appears in a different color.

  To check if any filter is specified as part of the view definition, open the Edit view page for the current view, and look in the Filter section.

• The column is hidden, or the column is not included in the view definition.

  To show all hidden columns, right-click the top left cell in the view and click Unhide.

  To check if a column is included in the view, open the Edit view page for the current view, and look in the Columns section. If the Display check box is not selected, select it to include the column in the view.

• The list requires content approval, and some or all of your items are either still pending or have been rejected.

  To check the approval status of your items, open the list in My Submissions view and look in the Approval Status and Comment columns. If an item has been rejected, edit the item. The item will be set to pending and will be sent for approval again.

• No response from the server. This could be because of a timeout.
• Server is busy or cannot be found.
• Any other unexpected error.

• You do not have the necessary permissions to make the change.
• You have been blocked from adding content to the site.
• You have exceeded your storage limits for the site.

The view does not include one or more columns that are marked required. A row must have non-blank values in its required columns before it can be submitted to the server.

Because the view does not include one or more required columns, you will not be able to do the following:

• Add new rows.
• Edit a row if it has a blank value in one of its required columns.

  Note  A column that is marked required will not accept blank values. However, a column that was not marked required but was subsequently modified to require non-blank values might contain blank values. So when you change the setting of a column from Not required to Required, edit the list in Datasheet view to ensure that the column has a non-blank value for each row.

To avoid this message, either add the required fields to the view, or contact the list author.