Actually i have gone through this below circuit diagram for the dc to ac pure sine wave inverter
**broken link removed**
when i am doing simulation for the above circuit in proteous 7 professional i am getting these kind of errors
please tell me how to over come these errors
It appears that you blindly copied some circuits and expect that to work.
For a successful project you must do the following :
Understand the theory (Inverters)
Do a literature review of similar systems
Analyze and understand how similar systems work
Do experimental design and testing of your own design