lldb中 po 命令正常 用e命令赋值就出错

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1

(lldb) po [[NSData alloc]initWithBase64EncodedString:$pTest5 options:0]

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(lldb) e NSData * $pTest7 = [[NSData alloc]initWithBase64EncodedString:$pTest5 options:0];

error: no known method ‘-initWithBase64EncodedString:options:’; cast the message send to the method’s return type

这是啥情况啊