Been posted before, just a few posts down. Try the fix posted in https://forums.factorio.com/viewtopic.php?p=527266#p527266

That should reset the script files in the save to the current versions and resolve the issue.


i deleted those part of save and game continues i mean i get science pack ...

The scenario level caused a non-recoverable error.
Please report this error to the scenario author.

Error while running event level::on_rocket_launched (ID 10)
__core__/lualib/silo-script.lua:36: attempt to index field 'finished' (a nil value)
stack traceback:
__core__/lualib/silo-script.lua:36 ...