As recently discussed, current error display using toast-messages is not very verbose and do not really tell the user what is going on.
An error log that users can access with more descriptive messages and that holds the last 5 errors or so would be much better.
My suggestion is this:

• keep the toast messages as an immediate alert
• in addition, turn the info symbol in the UI into a red exclamation mark until the user clicks on it
• add a text field at the bottom of the info panel (below the buttons) that is hidden by default and shows the last errors
• add more descriptive strings to be displayed in that text field
• add more error types to better distinguish different issues (no ram for bus, no ram for global buffer, no ram for segment, no ram for tansitions, pin conflicts, ...)