As many people have the above issue in nopcommerce , When any one done some changes in their plugin and after that they deploy it on server at that time they was got above error.
Here I am try to explain some reason that may be responsible for that error.
1) First of all check that you have deployed all the plugin files properly on server.
2) That most common mistake is same name of system name in description.txt file under your plugin folder.
Just find the duplicate entry into in description.txt file under your plugin folder and everything work fine.
I hope you have get something from it and overcome with this issues, if you still face the same issue then please comment it, I will try to resolve your problem. 😎
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