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Invalid reference format

Hello, everyone.

Before posting, I followed the recommendations. Unfortunately, it appears that the invalid reference format error can be because of any number of issues. So, alas, I am posting here. This is my first time using Docker, so my apologies for this noob question.

Issue type: invalid reference format when running docker command
OS: macOS Mojave 10.14.6
App version: 2.2.0.3 (42716)
Steps reproduce: run the command

I am attempting to set up and run the Data Studio 4.1.3 container and, copied directly from the website’s instructions, one is suppose to run the following command. It immediately returns the invalid reference format error message. Would anyone happen to see what might be incorrect?

docker run -h datastudio_
–name datastudio --restart=always \ --detach \ -p 5901:5901 -p 6901:6901
–env-file .env_list \ -v :/headless/IBM/rationalsdp/workspace