Hi Yawu,

Seems like a graphics driver issue. Does running "glxinfo" give the same error? What OS are you using?

Andrew


> On Oct 24, 2017, at 3:36 AM, Liu Y <liuy8866@gmail.com> wrote:
>
> Dear Experts,
> When I run qdec, it showed me error message, any suggestins?
>  qdec
> X Error of failed request:  BadValue (integer parameter out of range for operation)
>   Major opcode of failed request:  154 (GLX)
>   Minor opcode of failed request:  3 (X_GLXCreateContext)
>   Value in failed request:  0x0
>   Serial number of failed request:  1571
>   Current serial number in output stream:  1572
>
> Thanks in advance,
> Yawu
>
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