I presume you have added a vst-plugin?
Read this:
https://lmms.io/wiki/index.php?title=Wo ... d_problems
That should solve your problem
Besides that, since you are new here- Welcome to the forum arvindravii ! Here are all our important links:
viewtopic.php?f=1&t=4740
-And a few rules for Avatars, signatures, posting and using the right sub-forum :)
If you like to introduce yourself, to the community, go here:
viewtopic.php?f=4&t=4480
In that post you will also learn, how to post pictures in forum :)