FDSV-01203: Unable to install plugin

 at flexagon.fd.services.plugin.exec.lifecycle.UnixPluginLifecycle.installPlugin(UnixPluginLifecycle.java:446)
    at flexagon.fd.services.plugin.exec.lifecycle.PluginExecutionLifecycle.execute(PluginExecutionLifecycle.java:91)
    at flexagon.fd.services.endpoint.EndPointService.execute(EndPointService.java:136)
    at flexagon.fd.services.plugin.PluginExecutionWorker.call(PluginExecutionWorker.java:102)
    at flexagon.fd.services.plugin.PluginExecutionWorker.call(PluginExecutionWorker.java:33)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)
Caused by: net.schmizz.sshj.xfer.scp.SCPException: Received unknown response code
    at net.schmizz.sshj.xfer.scp.SCPEngine.check(SCPEngine.java:75)
    at net.schmizz.sshj.xfer.scp.SCPUploadClient.startCopy(SCPUploadClient.java:75)
    at net.schmizz.sshj.xfer.scp.SCPUploadClient.copy(SCPUploadClient.java:54)
    at net.schmizz.sshj.xfer.scp.SCPUploadClient.copy(SCPUploadClient.java:47)
    at net.schmizz.sshj.xfer.scp.SCPUploadClient.copy(SCPUploadClient.java:43)
    at net.schmizz.sshj.xfer.scp.SCPFileTransfer.upload(SCPFileTransfer.java:98)
    at net.schmizz.sshj.xfer.scp.SCPFileTransfer.upload(SCPFileTransfer.java:61)
    at net.schmizz.sshj.xfer.scp.SCPFileTransfer.upload(SCPFileTransfer.java:55)
    at flexagon.fd.model.endpoint.ssh.FlexSSHClient.uploadInternal(FlexSSHClient.java:481)
    at flexagon.fd.model.endpoint.ssh.UnixSSHClient.upload(UnixSSHClient.java:143)
    at flexagon.fd.services.plugin.exec.lifecycle.UnixPluginLifecycle.installPlugin(UnixPluginLifecycle.java:435)
    ... 8 more
    at flexagon.fd.services.workflow.execution.steps.BaseWorkflow.handleException(BaseWorkflow.java:38)
    at flexagon.fd.services.workflow.execution.steps.InvokePluginStep.executeStep(InvokePluginStep.java:264)
    at flexagon.fd.services.workflow.execution.WorkflowEngine.processStep(WorkflowEngine.java:1381)
    at flexagon.fd.services.workflow.execution.WorkflowEngine.processMultipleSteps(WorkflowEngine.java:1306)
    at flexagon.fd.services.workflow.execution.WorkflowEngine.executeInternal(WorkflowEngine.java:1051)
    at flexagon.fd.services.workflow.execution.WorkflowEngine.execute(WorkflowEngine.java:479)
    at flexagon.fd.services.workflow.execution.WorkflowExecutionWorker.execute(WorkflowExecutionWorker.java:131)
    at flexagon.fd.services.workflow.execution.WorkflowExecutionWorker.run(WorkflowExecutionWorker.java:62)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)
This error occurs when there is an echo in the .basrc file.
Commenting or removing the echo statement will get rid of the error.
SCPException: Received unknown response code with atmoz/sftp docker image · Issue #578 · hierynomus/sshj