无法在线更新plesk，提示错误There are no enabled Yum repositories, installation is not possible.是不是需要卸载yum源，重新安装yum

Execution failed.
Command: autoinstaller
Arguments: Array
(

[0] => --select-product-id
[1] => plesk
[2] => --select-release-current
[3] => --upgrade-installed-components
[4] => --include-components-from-class
[5] => vendor=parallels
[6] => --include-components-from-class
[7] => patched

)

Details: Doing restart of Plesk Installer...
Downloading file products.inf3: 0%
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Downloading file plesk.inf3: 0%
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Downloading file sitebuilder.inf3: 0%
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Downloading file billing.inf3: 0%
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Downloading file php71.inf3: 0%
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Downloading file pmm.inf3: 0%
Downloading file pmm.inf3: 100% was finished.
Checking for installed packages...
Downloading file PSA_12.5.30/plesk-12.5.30-cos6-x86_64.inf3: 0%
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Downloading Extensions Catalog feed...
Downloading file PSA_12.5.30/plesk-patches-12.5.30-cos6-x86_64.inf3: 0%
Downloading file PSA_12.5.30/plesk-patches-12.5.30-cos6-x86_64.inf3: 100% was finished.
Downloading file SITEBUILDER_12.5.30/sitebuilder-12.5.30-rhall-all.inf3: 0%
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Downloading file BILLING_12.5.29/billing-12.5.29-rhall-all.inf3: 0%
Downloading file BILLING_12.5.29/billing-12.5.29-rhall-all.inf3: 100% was finished.
Downloading file NGINX_1.11.1/nginx-1.11.1-cos6-x86_64.plesk12.inf3: 0%
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Downloading file PHP_7.0.16/php70-7.0.16-cos6-x86_64.inf3: 0%
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Downloading file PHP_5.6.30/php56-5.6.30-cos6-x86_64.inf3: 0%
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Downloading file PHP_5.4.45/php54-5.4.45-cos6-x86_64.inf3: 0%
Downloading file PHP_5.4.45/php54-5.4.45-cos6-x86_64.inf3: 100% was finished.
Downloading file PHP_5.3.29/php53-5.3.29-cos6-x86_64.inf3: 0%
Downloading file PHP_5.3.29/php53-5.3.29-cos6-x86_64.inf3: 100% was finished.
Downloading file PHP_5.2.17/php52-5.2.17-cos6-x86_64.inf3: 0%
Downloading file PHP_5.2.17/php52-5.2.17-cos6-x86_64.inf3: 100% was finished.
Downloading file PMM_0.1.10/pmm-0.1.10-cos6-x86_64.inf3: 0%
Downloading file PMM_0.1.10/pmm-0.1.10-cos6-x86_64.inf3: 100% was finished.
gpg-pubkey-85c6cd8a-4e060c35 gpg(Nux.Ro (rpm builder) rpm@li.nux.ro)
gpg-pubkey-c105b9de-4e0fd3a3 gpg(CentOS-6 Key (CentOS 6 Official Signing Key) centos-6-key@centos.org)
gpg-pubkey-914bdf7e-55c05220 gpg(Plesk Team info@plesk.com)
gpg-pubkey-66534c2b-52c32643 gpg(ATrpms (rpm signing key) )
Loaded plugins: fastestmirror
There are no enabled Yum repositories, installation is not possible.
Detecting installed product components.
Retrieving information about the installed license key...
Launching component checkers...
Downloading file PSA_12.5.30/examiners/panel_preupgrade_checker.php: 0%
Downloading file PSA_12.5.30/examiners/panel_preupgrade_checker.php: 100% was finished.
Downloading file PSA_12.5.30/examiners/php_launcher.sh: 0%
Downloading file PSA_12.5.30/examiners/php_launcher.sh: 100% was finished.
Loaded plugins: fastestmirror
There are no enabled Yum repositories, installation is not possible.