Fix a MetaTrade5 script

I am looking for someone that is able to fix the below errors in a MetaTrade5 script I have written.

'SYMBOL_SESSION_PRICE_MAX' - undeclared identifier on line 16
'SymbolInfoDouble' - no one of the overloads can be applied to the function call on line 16
'SYMBOL_SESSION_PRICE_MIN' - undeclared identifier on line 17
'SymbolInfoDouble' - no one of the overloads can be applied to the function call on line 17
')' - open parenthesis expected on line 20,21,32,33,52 & 53
'OP_BUYSTOP' - undeclared identifier 50PPDAY.mq5 on line 35
'OrderSend' - wrong parameters count 50PPDAY.mq5 on line 35
'OP_SELLSTOP' - undeclared identifier 50PPDAY.mq5 on line 55
'OrderSend' - wrong parameters count 50PPDAY.mq5 on line 55