5 Common Flutter/Dart Errors You May Encounter on a Daily Basis As a Flutter Developer

Artur Shamsutdinov

We encounter many flutter and dart errors every day as we code the shit out of ourselves on our IDE. Some might be noticeably easy to solve while others are not.

Here are some common errors you might face while building the flutter app:

“type ‘Future<dynamic>’ is not a subtype of type ‘String’”

Solution: This error usually occurs when you are trying to assign the result of an async function to a String variable. To fix this, you can use the await keyword to wait for the async function to complete and assign its result to the variable.

“type ‘_InternalLinkedHashMap<String, dynamic>’ is not a subtype of type ‘Map<String, dynamic>’”

Solution: This error usually occurs when you are trying to assign a map data type to a variable with a different type of map. To fix this, you can ensure that both the variable and the data being assigned to it have the same type of map.

“The named parameter ‘context’ isn’t defined”

Solution: This error occurs when you are trying to use a named parameter in a function or widget but have not defined it in the function or widget definition. To fix this, you can either define the named parameter in the function or widget definition or remove it from the function or widget call.

“The method ‘xxx’ isn’t defined for the class ‘yyy’”

Solution: This error occurs when you are trying to call a method or function that does not exist in the class or object. To fix this, you can either define the method or function in the class or object or use a different method or function that does exist.

“Too many positional arguments: 0 expected, but 1 found”

Solution: This error occurs when you are trying to call a function or widget with too many arguments. To fix this, you can either remove the extra argument or ensure that the function or widget definition includes the correct number of positional arguments.

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