Hello @shirvanagainer !
Welcome to the Canvas Community!
So the error message displayed "The assignment is part of an unpublished module and is not available yet". is because the assignment is set under a module which has not been published by the author.
How do I use Draft State in Modules?
In order for the student to see the assignment ensure that the parent module is published, as seen below.
Publish a Module
To publish a module, click the module's unpublished icon. The hover text will confirm you want to publish the module.
Note: Publishing a module will automatically publish any unpublished content items within the module.
Let me know if you need any further assistance
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