高手请进：abaqus做随机振动仿真出现如下罕见错误提示
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我做一个振动工装的模态+随机响应分析，设置如下，加载了U1/U2/U3三个方向的PSD，提交分析出现如下错误，不晓得是哪里出现了问题，请高手解答。
Error in job Job-3: LOAD CASE 4 HAS BEEN GIVEN IN STEP 0 ON A *CORRELATION OPTION WHICH REFERENCES A BASE MOTION *PSD-DEFINITION OPTION. HOWEVER, THIS LOAD CASE DOES NOT EXIST ON ANY *BASE MOTION OPTION IN THIS STEP.
Job Job-3: Analysis Input File Processor aborted due to errors.
