Insufficient number of observations

[Malcs]

Hi there, I'm new to EViews and would like to find out what I am doing wrong here... I am currently using monthly time series data and the dependent variable (sol), I used Genr and typed the formula rsol = 100*log(sol). Then for the 19 independent variables I used the following formula dvariable = variable - variable(-1). And I get the error Insufficient number of observations. The new independent differenced time series data shows N/A at the beginning and zero at the end but the dates are correct. Assistance would be appreciated.

[startz]

Do you have more months than right hand side variables? You might want to post your workfile.

[Malcs]

Thank you for your response, we decided to add the excel spreadsheet by importing the data again and the program worked.