When I attach symbol from in s7-plcsim it will popup 257:5, p7vrislx.dll error.

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one or more objects or a type cannot be represented.
Server 'p7vrislx.dll' for _U7T_USD_S32S_ETER_CT objects could not be loaded.
Make sure the required software packages are installed.
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In some cases it shows _P7VR_CBP_LD_ETER_CT could not be loaded.

I did not use any DriverES...... In most cases s7-plcsim seems working well, but I cannot confirm.

Any suggestion?  Great Thanks......
Software details: Step7 2010 Pro SR3+ WinCC Flexible 2008 sp3 with update5, running in a win7 32bit vmware.

Thanks.

I use previous snapshot of vmware image and it works well.

I think I instailled a wrong version of DriverES called DriveESPCS7V6_1.

Problem solved.