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Could not find a matching version of package Error

Could not find a matching version of package Error

Hello guys,

I want to install extention my Magento website but Im facing a problem. Im entering terminal and go to root directory and running this code:

composer require firebar/importexport-msi:1.1.0

I have a problem then code run. This problem:

[InvalidArgumentException]
  Could not find a matching version of package firebar/importexport-msi. Check the package spelling, your version constraint and that the package is availabl
  e in a stability which matches your minimum-stability (stable).

Can you help me for this error?