osx - Can't get launchd plist run successfully?

I'm leaing to use launchd to auto-run some scripts. To make it simple, I decide to use a shell script which only contains a echo command.

hello.sh

#! /bin/sh
echo "hello"

Also I've run chmod a+x hello.sh to make it executable and when I run the script manually it works fine.

In ~/Library/LaunchAgents/ I have com.yang.hello.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
    <dict>
        <key>Label</key>
        <string>com.yang.hello</string>
        <key>Program</key>
        <string>/Users/yangyy/hello.sh</string>
        <key>RunAtLoad</key>
        <true/>
    </dict>
</plist>

After I run

launchctl load -w ~/Library/LaunchAgents/com.yang.hello.plist

no error message appears and there retus

-   78  com.yang.hello.plist

when I run launchctl list | grep "com.yang.hello"

It seems that positive number indicates the exit code and the program is not actually running.

Besides, I find something strange when I tried to use launchctl start ~/Library/LaunchAgents/com.yang.hello.plist to run the program, but when I use this command it retus error and no error message.

What's wrong?

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