You can create a certificate bundle by using a plain text editor such as notepad. All of the characters including the -----BEGIN CERTIFICATE----- and -----END CERTIFICATE----- tags need to be inserted into the document. There should be no space between the certificates, for example no spaces or extra lines between -----END CERTIFICATE----- of certificate 1 and -----BEGIN CERTIFICATE----- of certificate 2. At the end of the file there should be 1 extra line. Save the file with an extension of .pem, .cer, or .crt.
Make sure you cert file had" -----BEGIN CERTIFICATE----- and -----END CERTIFICATE----- " char.
