参数“#2”不能转换“System.Collections.Generic.List”<string>

Question

I'm implementing an achievement system to my game and i can not find the way to solve this error:

error CS1503: Argument `#2' cannot convert `System.Collections.Generic.List<string>' expression to type  `System.Collections.Generic.List<Achievement>'

This is my code

public AchievementsManager( )
{
    _achievementKeeper = new Dictionary<AchievementType, int>();
    // ideally, load here previous, saved values.
    // tap = 0
    // die = 1
    // start = 12
    // score = 1231

    _achievements = new Dictionary<AchievementType, List<Achievement>>();

    List<string> listStart = new List<string>();
    listStart.Add(new Achievement() { countToUnlock = 3, isUnlocked = false, Message = "First Time Playing!" });
    listStart.Add(new Achievement() { countToUnlock = 8, isUnlocked = false, Message = "Fifth Time is the Charm?" });
    listStart.Add(new Achievement() { countToUnlock = 10, isUnlocked = false, Message = "Hello and Welcome Back!" });
    listStart.Add(new Achievement() { countToUnlock = 16, isUnlocked = false, Message = "Tapping Time!!" });
    listStart.Add(new Achievement() { countToUnlock = 50, isUnlocked = false, Message = "Perseverance Lvl 1!" });

    _achievements.Add(AchievementType.Start, listStart );
}

Answer 1

You are creating List<string> listStart , but you are dealing with it as with a List<Achievement> . Replace this line

List<string> listStart = new List<string>();

with this one:

List<Achievement> listStart = new List<Achievement>();

Answer 2

listStart is of type List<string> but you are adding to it Achievement objects. Change it to

List<Achievement> listStart = new List<Achievement>();