ماذا تعنى هذه الاخطاء وكيفية علاجها

   Implicit conversion from 'String' to 'Double'.      1
 

2        Implicit conversion from 'Object' to 'Double'. 
 

3         Operands of type Object used for operator '+'; runtime errors could occur. 

  4       Implicit conversion from 'Double' to 'String'.
 

5    Implicit conversion from 'Object' to 'Integer'.