price moved--problem solver

Hi...get anyone can help my problem? that I do BUY contract without the price proposal , this code can do with no delay, here this code:
("{
""buy"": ""1"",
""price"": 1,

""parameters"":
{
""amount"": ""5"",
""basis"": ""stake"",
""contract_type"": ""CALL"",
""currency"": ""USD"",
""duration"": ""5"",
""duration_unit"": ""t"",
""symbol"": ""R_75""
}
}")

but, if i do it again...the msgbox appear

what's the problem of that...thanks

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