Issue with Docker Toolbox

I have been getting the following problem after getting Docker set-up on a Mac OS using the Docker Toolbox:

Pulling repository
Error while pulling image: Get x509: certificate signed by unknown authority

I have seen some potential solutions to this problem on StackOverflow, but none of them seems to be working for me. For example, I have checked the date, which is set correctly in my case. Does anyone know of a solution for the Docker Toolbox on a Mac OS X?

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