stdlib using stdlib.ex4
#import "stdlib.ex4"
so open libraries\stdlib.mq4 compile and than recompile ur ea
#import "stdlib.ex4"
This line already exists in the header file.
Not to sound presumptious or anything, but mine works (tested and working) like
#include <stdlib.mqh>
Also running build 402. Problem must be elsewhere. Try recompiling (which you probably did), ammmm rechecking whether the file didnt get deleted by any chance.... I dont know, but it must be some silly reason :))

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I get the following error message when calling the ErrorDescription function from the stdlib:
expert function calls are not allowed; 'stdlib'-'ErrorDescription'
This line is in my EA: #include <stdlib.mqh>
I've never had this problem before.
Currently running build 402.
Please help. Thanks.