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It's not references, it's using statements. Double click on the first error message, and the cursor will move to the first error.
Look at the word underlined in red - there is a small blue block under the first character. Hover your mouse over the block, and a drop down will appear - open the dropdown by moving the mouse over it, and click the down arrow. Select the first option 'using System.Runtime.InteropServices;' and over half of the 'errors' should vanish. Repeat another two times to pick up the other two using statements, and you should be good to go.