// 使用微信支付公钥的RSA配置
        Config config =
                new RSAPublicKeyConfig.Builder()
                        .merchantId(merchantId)
                        .privateKeyFromPath(privateKeyPath)
                        .publicKeyFromPath(publicKeyPath)
                        .publicKeyId(publicKeyId)
                        .merchantSerialNumber(merchantSerialNumber)
                        .apiV3Key(apiV3Key)
                        .build();

我在.publicKeyFromPath(publicKeyPath)这行报错：
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.wechat.pay.java.core.Config]: Factory method 'wechatPayConfigBuild' threw exception with message: Illegal base64 character 2d

我是在resources目录下，上传的apiclient_cert.pem文件，publicKeyPath的路径就是该文件的路径。请问这报错是什么问题？publicKeyFromPath这里读取的文件应该从哪获取