grcov gives an error to open some unknown file

[ns-pjasani]

I am trying to generate test coverage report using grcov in rust.

When I execute
~/.cargo/bin/grcov . --binary-path target/debug -s . -t html --branch --filter covered -o target/debug/coverage,

It gives an error as below:
A panic occurred at /path/.cargo/registry/src/index.crates.io-6f17d22bba15001f/grcov-0.8.19/src/producer.rs:174: Failed to open '/path/./some-file/db/user_defined'

Though ./some-file/db/user_defined file is not present in my project.

In my other rust project, it is working fine. Only in this project, I am getting this error.

I am using grcov-v0.8.19 and rust nightly-2024-02-20.

Could anyone please help me with the solution ?