I don’t understand why it’s not possible to deploy the bot?

Question

Java

I want to deploy telegram bot'a writes an error:

020-09-16T19:16:07.167880+00:00 app[java.1]: Picked up JAVA_TOOL_OPTIONS: -Xmx300m -Xss512k -XX:CICompilerCount=2 -Dfile.encoding=UTF-8 
2020-09-16T19:16:07.271648+00:00 app[java.1]: no main manifest attribute, in out/artifacts/telebot2_jar/telebot2.jar

I specified in Procfile:

java: java -jar out/artifacts/telebot2_jar/telebot2.jar

How can I solve the error?
folder screenshot: