Negative net present value and discounted Payback period infinity !

Hi everyone, 

I am doing this rooftop assembly PV for a nameplate capacity of 10 KW , but I always get these errors mentioned in the title, any idea why? 
I am all new to this SAM software so please any help is much appreciated. 
attached the file
Thank you

Hi Abdullah,

For the Residential and Commercial financial model, a negative NPV indicates that the electricity bill savings are less than the project costs over the analysis period. To make the project economically viable you can try:

• Decreasing the installation and/or operating costs.
• Increasing the load on the Electricity Load page.
• Increasing the energy rates on the Electricity Rates page.
• Increasing the discount rate.

Best regards,
Paul.

Hi Paul,

Thank you very much for your answer solved my problem ! , I am also wondering how to include back tracking with this system as I don't see any box to tick for that matter. 

Best Regards.  

Hi,

Please ignore the last response my bad I found the box. 

Thanks