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Hi.
[1] Don't click on Run as NIOS... but click on Run Configurations, this will re-read the values if present and you will not get this error in a high frequency again.
[2] There are to few information given.
[3] This is also the way I do, but if someone say it is wrong, please do... Sometimes HDL-Signal-Names are replaced due to reduction of logic inside the synthesis, so the wire exists, but with an other name, but ST will be placed correctly.
[4] You can click on the Compilation report after re-opening the project. It is located (should be) the fifth symbol on the top, or is located at the menu <Processing> or via Shortcut Cntrl+R
I hope this helps
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and i add 2 questions, can you give me more advise?
thanks a lot !!