# Functional coverage report

**URL:** <https://verificationacademy.com/forums/t/functional-coverage-report/36178>\
**Category:** Coverage\
**Tags:** error, Coverage, Questa-102c, ucbd-file, vcover\
**Created:** [June 13, 2019, 11:31am UTC](https://verificationacademy.com/forums/t/functional-coverage-report/36178 "2019-06-13T11:31:51Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![MittalMaru](https://verificationacademy.com/forums/letter_avatar_proxy/v4/letter/m/b19c9b/32.png) [@MittalMaru](https://verificationacademy.com/forums/u/MittalMaru)\
**Post date:** [June 13, 2019, 11:31am UTC](https://verificationacademy.com/forums/t/functional-coverage-report/36178/1 "2019-06-13T11:31:51Z")

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hello,  
i have used this command to generate the coverage report in system verilog ‘vcover report -html -htmldir cov cover.ucdb’.  
but I am getting the error since my cover.ucdb file is also generated before this and present in the same directory.  
i am using questasim tool.  
Error: (vcover-7) Failed to open UCDB file “cover.ucdb” in read mode.

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<div class="post-metadata">

**Author:** ![thomellis](https://verificationacademy.com/forums/letter_avatar_proxy/v4/letter/t/8edcca/32.png) [@thomellis](https://verificationacademy.com/forums/u/thomellis)\
**Post date:** [June 13, 2019, 11:30pm UTC](https://verificationacademy.com/forums/t/functional-coverage-report/36178/2 "2019-06-13T23:30:02Z")

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_In reply to [Mittal Maru](https://verificationacademy.com/forums/t/functional-coverage-report/36178):_

This forum is not for tool related issues. Please refer to your tool documentation or contact your vendor support team for additional assistance.