Why am i getting this error  ?
 
 
http://imgur.com/a/IXFCg
 
Thanks 
 
Dan 

It looks like a problem with LP EQ which is part of that FX chain, so you might want to reinstall it. If you have access to it, the latest version is called L-Phase EQ in Command Center.

The chain is using LP-64 EQ which I thought I read wasn't shipped with SONAR anymore.  If that's true you would need to install something it was shipped with (X3) to get it.  The new fancy LP EQ has "replaced" it but it won't work on old projects/old preset FX chains.
 

It is not surprising that some of FX chains refer to discontinued plug-ins. May want to create a problem report when they are encountered to let Cakewalk know which FX chains no longer work.
 
The last installer to include the old LP plug-ins was EngineeringFXSuiteSetup_1.0.0.13.exe. If you have access to it, rollback or manually install it then reinstall the current version to satisfy the Command Center update indicator.
 
The plug-ins may also be installed from any older version of SONAR that included them by using the advanced install option.

scook
It is not surprising that some of FX chains refer to discontinued plug-ins. May want to create a problem report when they are encountered to let Cakewalk know which FX chains no longer work.
 
The last installer to include the old LP plug-ins was EngineeringFXSuiteSetup_1.0.0.13.exe. If you have access to it, rollback or manually install it then reinstall the current version to satisfy the Command Center update indicator.
 
The plug-ins may also be installed from any older version of SONAR that included them by using the advanced install option.

That's exactly what is happening, I would have thought Sonar would be on top of this themselves.
This time i have just changed how i have added the effect.
I will create a problem report 
 
 
Dan