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java.util.concurrent.RejectedExecutionException: null	at java.util.concurrent.ForkJoinPool.externalSubmit(ForkJoinPool.java:2328)	at java.util.concurrent.ForkJoinPool.externalPush(ForkJoinPool.java:2419)	at java.util.concurrent.ForkJoinPool.submit(ForkJoinPool.java:2675)	at java.util.concurrent.ForkJoinPool.submit(ForkJoinPool.java:169)	at com.github.triceo.robozonky.Investor.scheduleLoanRetrieval(Investor.java:117)	at com.github.triceo.robozonky.Investor.lambda$null$3(Investor.java:165)	at java.util.HashMap.compute(HashMap.java:1188)	at com.github.triceo.robozonky.Investor.lambda$retrieveInvestmentsRepresentedByBlockedAmounts$4(Investor.java:165)	at java.util.ArrayList.forEach(ArrayList.java:1249)	at com.github.triceo.robozonky.Investor.retrieveInvestmentsRepresentedByBlockedAmounts(Investor.java:157)	at com.github.triceo.robozonky.Investor.invest(Investor.java:258)	at com.github.triceo.robozonky.app.Remote.lambda$getInvestingFunction$1(Remote.java:101)	at com.github.triceo.robozonky.app.Remote.invest(Remote.java:113)	at com.github.triceo.robozonky.app.Remote.lambda$call$3(Remote.java:136)	at com.github.triceo.robozonky.app.authentication.AuthenticationHandler.execute(AuthenticationHandler.java:211)	at com.github.triceo.robozonky.app.Remote.call(Remote.java:136)