[seL4] capability name change

Hi: Between version 9.0.1 and 10.0.0, the capability name seL4_CapIOPort changed to seL4_CapIOPortControl in the file seL4/libsel4/include/sel4/bootinfo_types.h. I have some legacy code written for 9.0.1 that I want to port to 10.0.0. When I changed the occurrences of seL4_CapIOPort to seL4_CapIOPortControl, I am getting the following: Warning: copy: seL4_CNode_Copy (0x7) returned 3 followed some time later by: Warn<<seL4(CPU 0) [decodeInvocation/530 T0xffffff80002de400 "child of: 'child of: 'rootserver''" @20f27a4]: Attempted to invoke a null cap #7.>> What am I doing wrong? thanks in advance, Sachin