AWESOME!!! I added 3.5 and it removed all the errors but 3. I tried all solutions you posted but cant seem to get rid of these 3 errors 
Maybe im not knowing where to add the reference… Im adding it in the main mission planner solution, is this right? Im sorry for the trouble and thank you so much!
| Severity | Code | Description | Project | File | Line | Suppression State |
|---|---|---|---|---|---|---|
| Error | CS0234 | The type or namespace name ‘Speech’ does not exist in the namespace ‘System’ (are you missing an assembly reference?) | MissionPlanner.Utilities(netstandard2.0) | D:\Programming\Mission Planner\ExtLibs\Utilities\Speech.cs | 5 | Active |
| Error | CS0246 | The type or namespace name ‘SpeechSynthesizer’ could not be found (are you missing a using directive or an assembly reference?) | MissionPlanner.Utilities(netstandard2.0) | D:\Programming\Mission Planner\ExtLibs\Utilities\Speech.cs | 19 | Active |
| Error | CS0234 | The type or namespace name ‘Speech’ does not exist in the namespace ‘System’ (are you missing an assembly reference?) | MissionPlanner.Utilities(netstandard2.0) | D:\Programming\Mission Planner\ExtLibs\Utilities\Speech.cs | 22 | Active |