hi there, i have an error while my blynk example nodmcu connecting to blynk server and i changed the verison of blynk library and its the same, can i know the answer please,
my board NodeMce and i use the example of library
There are many reasons to justify this behavior, but to get some help you will need to share more information, as your board and “formatted” code.
my board NodeMce and i use the example of library
What example?.. there are many floating around this forum and the Web… some use outdated commands, etc.
Your error simply means the device is not connecting to the server… there could be dozens of reason/solutions.
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example>blynk>board wifi>nodemcu
this is the example, i know my board cant connect to the server but i dont know why
last time when i had problem like that i changed the version of blynk library and its work, but now no.
And based on your extensive details of what you are using for code, have already tried, and what you see in the debuging… well, we don’t know either 
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Perhaps a silly question, but… Have you adopted this aforementioned example to your network/project?
yes sure, the example was working fine but now the board cannot connect to blynk server
Then it might be some network issue. Check server IP with Ping command, check DNS settings. You can try with known and working DNS server too (for example GOOGLE’s 8.8.8.8). You can try with HTTP API and browser to read some stored value or set some value and wait for response. Eventually (if server IP has been positively verified) you can try with Blynk.begin() and hardcoded server IP address.
Try to search the forum- it’s all here.