C++ Run Time Pure Function Call Error

Jan 6, 2016 at 4:50 PM
Hi .I write a C# hospital scheduler system for scheduling patients , my system has a calling system and patient can get visit time by calling one of our 8 phone number , i use multi thread for implementation of multi line calling system and in each thread i create a new instance of itapi . every thing is working very well but some time i get C++ run time Pure function call error and i dont know why it is happen and how can i fix this .