Jmeter错误：MIME类型可能不包含保留字符

Question

从CSV文件读取时出现错误：MIME类型可能不包含保留字符，当我在Jmeter UI中对相同的值进行硬编码时，它会起作用-

java.lang.IllegalArgumentException: MIME type may not contain reserved characters
    at org.apache.http.util.Args.check(Args.java:36)
    at org.apache.http.entity.ContentType.create(ContentType.java:227)
    at org.apache.http.entity.ContentType.create(ContentType.java:239)
    at org.apache.jmeter.protocol.http.sampler.HTTPHC4Impl.setupHttpEntityEnclosingRequestData(HTTPHC4Impl.java:1469)
    at org.apache.jmeter.protocol.http.sampler.HTTPHC4Impl.handleMethod(HTTPHC4Impl.java:794)
    at org.apache.jmeter.protocol.http.sampler.HTTPHC4Impl.sample(HTTPHC4Impl.java:569)
    at org.apache.jmeter.protocol.http.sampler.HTTPSamplerProxy.sample(HTTPSamplerProxy.java:67)
    at org.apache.jmeter.protocol.http.sampler.HTTPSamplerBase.sample(HTTPSamplerBase.java:1231)
    at org.apache.jmeter.protocol.http.sampler.HTTPSamplerBase.sample(HTTPSamplerBase.java:1220)
    at org.apache.jmeter.threads.JMeterThread.doSampling(JMeterThread.java:622)
    at org.apache.jmeter.threads.JMeterThread.executeSamplePackage(JMeterThread.java:546)
    at org.apache.jmeter.threads.JMeterThread.processSampler(JMeterThread.java:486)
    at org.apache.jmeter.threads.JMeterThread.run(JMeterThread.java:253)
    at java.lang.Thread.run(Unknown Source)

从csv读取

Jmeter UI（从csv读取，给出上述错误）

Jmeter UI（硬编码mime类型的作品）