Incompatible LiveCycle Designer Version

have adobe livecycle designer 8.0 installed (came adobe acrobat 8.0 professional) on pc. have adobe livecycle workbench installed on pc. when tried create/open pdf/xdp file workbench, got "incompatible livecycle designer version" dialog box poped following information:

the active version of livecycle designer not compatible version of workbench.

please lanuch version of livecycle designer 8.1 or later , make active, , try opening form again.

details:
plug-in provider: adobe systems, incorporated
plug-in name: livecycle form designer
plug-in id: com.adobe.designer
plug-in version: 8.0.3116.1

can me how solve problem?

thanks in advance!

i have upgraded adobe acrobat profession v8.0 v8.1, designer still version 8.0 , problem still exists.

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