One of the main reasons for this error is that the uploaded certificate does not have the begin and end tags.
After inserting these tags, you should be able to upload the certificate successfully.
Steps:
Open the certificate in a text editor and add the begin and end tags. The certificate should look like the below example:
-----BEGIN CERTIFICATE----- MIIF/zCCA+egAwIBAgIUEMvqGHErx4Cd6C7R6xM4trXot78wDQYJKoZIhvcNAQEL BQAwYzELMAkGA1UEBhMCQ0gxLDAqBgNVBAoTI1F1b1ZhZGlzIFRydXN0bGluayBT d2l0emVybGFuZCBMdGQuMSYwJAYDVQQDEx1RdW9WYWRpcyBTd2lzcyBBZHZhbmNl ZCBDQSBHMjAeFw0xNjA0MTgxMjUyMDdaFw0xOTA0MTgxMjUyMDVaMIGIMQswCQYD VQQGEwJDSDELMAkGA1UECBMCQlMxDjAMBgNVBAcTBUJhc2VsMSIwIAYDVQQKExlO ryhUXLEafcRv3FXr3TTymaw6+8UApVXLrluCJ92nsS34deaHjQcLjn+XJzYUV3Od RM6lga67ahG6+FWID35SSaFr2bCEhBQo+q5Uc0CE5JVEjJJdhu43w/HihgPooaGZ Z7eFExRgc0FxyH0Ov/qR7Qa2LtCs2Aitdg7ho0ccnRJ2pOpfQRLh6274opRdI3UN Mj0r -----END CERTIFICATE-----
Note - This is just a sample certificate and not for use.
000381746

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