If you don't want to modify anything you could just run
As the problematic user (root in this case). That will help you track down the issue. The output can be a bit complicated though, depending on how complex your ~/.bashrc file is.
But, for the look of it, I think that you are either missing the left-most part of a variable declaration. It should usually look like this:
# or in this case probably
Maybe your "admin" just wrote something like
Which doesn't make any sense and is not a correct bash syntax. The right solution will vary depending on what the intended purpose for that line was. Removing or commenting it should take rid of the warning though. It shouldn't have any side effect other than that though, since that line is incorrect anyway and it doesn't declare anything or do any other thing other than spitting an error message.