transformation editor not working - " The transformation editor must be opened via the Camel editor"

The transformation editor must be opened via the Camel editor

eclipse.buildId=11.3.0.GA-v20180413-0714-B2352
java.version=1.8.0_172
java.vendor=Oracle Corporation
BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=en_US
Framework arguments: -product com.jboss.devstudio.core.product
Command-line arguments: -os win32 -ws win32 -arch x86 -product com.jboss.devstudio.core.product

error log:

!ENTRY org.eclipse.ui 4 4 2018-07-31 16:54:47.863
!MESSAGE Unable to create part
!SUBENTRY 1 org.eclipse.ui 4 0 2018-07-31 16:54:47.863
!MESSAGE The transformation editor must be opened via the Camel editor.