Exception while creating a jar file for bean

Friendz,
I am getting this error whenever i tried to create a jar file.
I am using win 98 os and jdk1.4 please tell me what error it is
C:\bean\programs\spectrum>jar cfm a.jar manifest.mft spectrum.class
java.io.IOException: invalid header field
at java.util.jar.Attributes.read(Attributes.java:355)
at java.util.jar.Manifest.read(Manifest.java:162)
at java.util.jar.Manifest.<init>(Manifest.java:52)
at sun.tools.jar.Main.run(Main.java:124)
at sun.tools.jar.Main.main(Main.java:904)
Contents of manifest template file:
Name:spectrum.class
Java-Bean:True

Manifests are saved with the .mf file extension. Rename your manifest mainfest.mf.

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