im runing codesys 3.5.17.0, im having a Wago 750-8213. when uploding PLC program im getting thees
[FATAL ERROR] Unresolved reference: 'CL2_DELETERECEIVER'
[FATAL ERROR] Unresolved reference: 'CL2_GETBUSALARM'
[FATAL ERROR] Unresolved reference: 'CL2_DRIVERCLOSE'
[FATAL ERROR] Unresolved reference: 'CL2_CREATEIDAREARECEIVER'
[FATAL ERROR] Unresolved reference: 'CL2_REGISTERIDAREA'
[FATAL ERROR] Unresolved reference: 'CL2_DRIVEROPENH'
[FATAL ERROR] Unresolved reference: 'CL2_CREATEMASKRECEIVER'
[FATAL ERROR] Unresolved reference: 'CL2_CREATESINGLEIDRECEIVER'
[FATAL ERROR] Unresolved reference: 'CL2_GETRECEIVECOUNTER'
[FATAL ERROR] Unresolved reference: 'CL2_GETRECEIVEERRORCOUNTER'
[FATAL ERROR] Unresolved reference: 'CL2_GETTRANSMITCOUNTER'
[FATAL ERROR] Unresolved reference: 'CL2_GETTRANSMITERRORCOUNTER'
[FATAL ERROR] Unresolved reference: 'CL2_GETBUSSTATE'
[FATAL ERROR] Unresolved reference: 'CL2_GETBAUDRATE'
[FATAL ERROR] Unresolved reference: 'CL2_GETBUSLOAD'
[FATAL ERROR] Unresolved reference: 'CL2_ISSENDINGACTIVE'
[FATAL ERROR] Unresolved reference: 'CL2_GETLOSTCOUNTER'
[FATAL ERROR] Unresolved reference: 'CL2_GETRECEIVEPOOLSIZE'
[FATAL ERROR] Unresolved reference: 'CL2_GETRECEIVEQUEUELENGTH'
[FATAL ERROR] Unresolved reference: 'CL2_GETTRANSMITPOOLSIZE'
[FATAL ERROR] Unresolved reference: 'CL2_GETTRANSMITQUEUELENGTH'
[FATAL ERROR] Unresolved reference: 'CL2_READ'
[FATAL ERROR] Unresolved reference: 'CL2_FREEMESSAGE'
[FATAL ERROR] Unresolved reference: 'CL2_RESETBUSALARM'
[FATAL ERROR] Unresolved reference: 'CL2_CREATEMESSAGE'
[FATAL ERROR] Unresolved reference: 'CL2_WRITE'
[FATAL ERROR] Unresolved reference: 'CL2_CSTCYCLECLOSE'

when i exclude a program from my build, it workes fine. but i do not have CAN bus running.

Hi, the CAN Libary you have in your project doesnt fit to the runtime you are using on the PFC.
When functions in a libary have an external implementation and the external implementation can not found in the firmware/runtime after the download you get the error message 'unresolved ref..'