我正在开发一个应用程序，当我尝试在运行Kit Kat的移动设备上安装它时工作正常但是当我尝试在具有L预览的设备上运行它时，logcat会显示一条错误，指出“安装错误：未知失败”。
我尝试将目标和目标SDK版本更改为L但没有运气。我还下载了L平台的SDK平台（API 20，L预览版）。
还有什么我需要下载的吗？任何意见都将深受赞赏。
我的Logcat显示如下所示的消息：
01-01 17:56:34.102: E/QC-QMI(386): linux_qmi_qmux_io.c: Unable to open port id /dev/mhi_pipe_14, error [2:No such file or directory]
01-01 17:56:34.102: E/QC-QMI(386): qmi_qmux_open_connection: QMI_QMUX_IO_PLATFORM_OPEN_CONN failed -1
01-01 17:56:34.102: E/QC-QMI(386): qmi_qmux_tx_msg: failed to open inactive connd_id=57
01-01 17:56:34.102: E/QC-QMI(386): qmi_qmux_open_connection: connection is disabled for conn_id=0
01-01 17:56:34.102: E/QC-QMI(386): qmi_qmux_tx_msg: failed to open inactive connd_id=0
01-01 17:56:34.102: E/QC-QMI(386): qmi_qmux: TX failed, connection inactive or in reset, conn_id=0, status_flags=4
01-01 17:56:34.102: E/QC-QMI(386): qmi_ctl_tx_msg: qmi_qmux_tx_msg failed
01-01 17:56:34.102: E/QC-QMI(386): qmi_ctl_handle_request: qmi_ctl_tx_msg call failed
01-01 17:56:34.102: E/QC-QMI(386): qmi_qmux_open_connection: connection is disabled for conn_id=0
01-01 17:56:34.102: E/QC-QMI(386): qmi_qmux_tx_msg: failed to open inactive connd_id=0
01-01 17:56:34.102: E/QC-QMI(386): qmi_qmux: TX failed, connection inactive or in reset, conn_id=0, status_flags=4
01-01 17:56:34.102: E/QC-QMI(386): qmi_ctl_tx_msg: qmi_qmux_tx_msg failed
01-01 17:56:34.102: E/QC-QMI(386): qmi_ctl_handle_request: qmi_ctl_tx_msg call failed
01-01 17:56:34.103: E/QC-QMI(386): linux_qmi_qmux_io.c: Unable to open port id /dev/mhi_pipe_14, error [2:No such file or directory]
01-01 17:56:34.103: E/QC-QMI(386): qmi_qmux_open_connection: QMI_QMUX_IO_PLATFORM_OPEN_CONN failed -1
01-01 17:56:34.103: E/QC-QMI(386): qmi_qmux_tx_msg: failed to open inactive connd_id=57
01-01 17:56:34.103: E/QC-QMI(335): qmi_client [335] 131: failed to locate client data
01-01 17:56:34.103: E/QC-QMI(386): qmuxd: RX on fd=18 returned error=0 errno[2:No such file or directory]
01-01 17:56:34.104: E/QC-QMI(386): qmi_qmux_tx_msg: failed to open inactive connd_id=57
谢谢， 沙善