ValueError No data provided for x3 Need data for each key in x1 x2 x3 x4 x5 x6 x7

This error occurs when the data provided for a particular key is missing. In this case, the error message indicates that the key 'x3' does not have any data provided for it.

To fix this error, you need to provide data for the missing key 'x3'. Make sure that there is a value assigned to each key in the list: ['x1', 'x2', 'x3', 'x4', 'x5', 'x6', 'x7']. Check your code or data input to ensure that all required keys have corresponding data values.