Mispelled classname in manifest.txt file caused this error

Im trying to run a java file outside of my IDE by exporting the .jar file to my documents folder and trying to display the text 'hello world'in the file on the terminal line. I attempted to create a Manifest.txt file with this in it,

Main-Class: lightning.java.hello.MyFirstClass

I then used this script to create a file MyJar.jar and got this back,

lightning@rigel5:~$ jar cfm MyJar.jar Manifest.txt lightning.java.hello/*.class
java.io.FileNotFoundException: Manifest.txt (No such file or directory)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.(FileInputStream.java:138)
at java.io.FileInputStream.(FileInputStream.java:97)
at sun.tools.jar.Main.run(Main.java:171)
at sun.tools.jar.Main.main(Main.java:1177)