Error with SSL : Could not decode Type datas , PKIU26E PKICER _ Error (Private and Public key incompatible (15034 / 0))

It is necessary that the certifcate Key should be in format DER and not in format PEM.
Please take reference of the help manual on PKIUTIL to convert it into format DER.
Generally, it is preferable that all the certificates are in format DER in case of CFT.